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Zithromax

Pronunciation

Generic Name: azithromycin dihydrate
Dosage Form: tablets and oral suspension

Zithromax®
(azithromycin tablets)
and
(azithromycin for oral suspension)

To reduce the development of drug-resistant bacteria and maintain the effectiveness of Zithromax® (azithromycin) and other antibacterial drugs, Zithromax (azithromycin) should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria.

Zithromax Description

Zithromax (azithromycin tablets and azithromycin for oral suspension) contain the active ingredient azithromycin, an azalide, a subclass of macrolide antibiotics, for oral administration. Azithromycin has the chemical name (2R,3S,4R,5R,8R, 10R,11R,12S,13S,14R)-13-[(2,6-dideoxy-3-C-methyl-3-O-methyl-α-L-ribo-hexopyranosyl) oxy]-2-ethyl-3,4,10-trihydroxy-3,5,6,8,10,12,14-heptamethyl-11-[[3,4,6-trideoxy-3- (dimethylamino)-β-D-xylo-hexopyranosyl]oxy]-1-oxa-6-azacyclopentadecan-15-one. Azithromycin is derived from erythromycin; however, it differs chemically from erythromycin in that a methyl-substituted nitrogen atom is incorporated into the lactone ring. Its molecular formula is C38H72N2O12, and its molecular weight is 749.00. Azithromycin has the following structural formula:

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Azithromycin, as the dihydrate, is a white crystalline powder with a molecular formula of C38H72N2O12•2H2O and a molecular weight of 785.0.

Zithromax is supplied for oral administration as film-coated, modified capsular shaped tablets containing azithromycin dihydrate equivalent to either 250 mg or 500 mg azithromycin and the following inactive ingredients: dibasic calcium phosphate anhydrous, pregelatinized starch, sodium croscarmellose, magnesium stearate, sodium lauryl sulfate, hypromellose, lactose, titanium dioxide, triacetin and D&C Red #30 aluminum lake.

Zithromax for oral suspension is supplied in bottles containing azithromycin dihydrate powder equivalent to 300 mg, 600 mg, 900 mg, or 1200 mg azithromycin per bottle and the following inactive ingredients: sucrose; sodium phosphate, tribasic, anhydrous; hydroxypropyl cellulose; xanthan gum; FD&C Red #40; and spray dried artificial cherry, creme de vanilla and banana flavors. After constitution, each 5 mL of suspension contains 100 mg or 200 mg of azithromycin.

Zithromax - Clinical Pharmacology

Pharmacokinetics

Following oral administration of a single 500 mg dose (two 250 mg tablets) to 36 fasted healthy male volunteers, the mean (SD) pharmacokinetic parameters were AUC0–72 = 4.3 (1.2) µg∙h/mL; Cmax = 0.5 (0.2) µg/mL; Tmax = 2.2 (0.9) hours.

With a regimen of 500 mg (two 250 mg capsules1) on day 1, followed by 250 mg daily (one 250 mg capsule) on days 2 through 5, the pharmacokinetic parameters of azithromycin in plasma in healthy young adults (18–40 years of age) are portrayed in the chart below. Cmin and Cmax remained essentially unchanged from day 2 through day 5 of therapy.

Pharmacokinetic Parameters (Mean) Total n=12
Day 1
 
Day 5
Cmax (µg/mL) 0.41 0.24
Tmax (h) 2.5 3.2
AUC0–24 (µg∙h/mL) 2.6 2.1
Cmin (µg/mL) 0.05 0.05
Urinary Excret. (% dose) 4.5 6.5

In a two-way crossover study, 12 adult healthy volunteers (6 males, 6 females) received 1,500 mg of azithromycin administered in single daily doses over either 5 days (two 250 mg tablets on day 1, followed by one 250 mg tablet on days 2–5) or 3 days (500 mg per day for days 1–3). Due to limited serum samples on day 2 (3-day regimen) and days 2–4 (5-day regimen), the serum concentration-time profile of each subject was fit to a 3-compartment model and the AUC0– for the fitted concentration profile was comparable between the 5-day and 3-day regimens.

3-Day Regimen 5-Day Regimen
Pharmacokinetic Parameter
[mean (SD)]
Day 1 Day 3 Day 1 Day 5
*
Total AUC for the entire 3-day and 5-day regimens
Cmax (serum, µg/mL) 0.44 (0.22) 0.54 (0.25) 0.43 (0.20) 0.24 (0.06)
Serum AUC0– (µg∙hr/mL) 17.4 (6.2)* 14.9 (3.1)*
Serum T1/2 71.8 hr 68.9 hr

Median azithromycin exposure (AUC0–288) in mononuclear (MN) and polymorphonuclear (PMN) leukocytes following either the 5-day or 3-day regimen was more than a 1000-fold and 800-fold greater than in serum, respectively. Administration of the same total dose with either the 5-day or 3-day regimen may be expected to provide comparable concentrations of azithromycin within MN and PMN leukocytes.

Two azithromycin 250 mg tablets are bioequivalent to a single 500 mg tablet.

1
Azithromycin 250 mg tablets are bioequivalent to 250 mg capsules in the fasted state.
Azithromycin 250 mg capsules are no longer commercially available.
Absorption

The absolute bioavailability of azithromycin 250 mg capsules is 38%.

In a two-way crossover study in which 12 healthy subjects received a single 500 mg dose of azithromycin (two 250 mg tablets) with or without a high fat meal, food was shown to increase Cmax by 23% but had no effect on AUC.

When azithromycin suspension was administered with food to 28 adult healthy male subjects, Cmax increased by 56% and AUC was unchanged.

The AUC of azithromycin was unaffected by co-administration of an antacid containing aluminum and magnesium hydroxide with azithromycin capsules; however, the Cmax was reduced by 24%. Administration of cimetidine (800 mg) two hours prior to azithromycin had no effect on azithromycin absorption.

Distribution

The serum protein binding of azithromycin is variable in the concentration range approximating human exposure, decreasing from 51% at 0.02 µg/mL to 7% at 2 µg/mL.

Following oral administration, azithromycin is widely distributed throughout the body with an apparent steady-state volume of distribution of 31.1 L/kg. Greater azithromycin concentrations in tissues than in plasma or serum were observed. High tissue concentrations should not be interpreted to be quantitatively related to clinical efficacy. The antimicrobial activity of azithromycin is pH related and appears to be reduced with decreasing pH. However, the extensive distribution of drug to tissues may be relevant to clinical activity.

Selected tissue (or fluid) concentration and tissue (or fluid) to plasma/serum concentration ratios are shown in the following table:

AZITHROMYCIN CONCENTRATIONS FOLLOWING A 500 mg DOSE (TWO 250 mg CAPSULES) IN ADULTS*
TISSUE OR FLUID TIME AFTER DOSE (h) TISSUE OR FLUID CONCENTRATION
(µg/g or µg/mL)
CORRESPONDING
PLASMA OR SERUM
LEVEL (µg/mL)
TISSUE (FLUID)
PLASMA (SERUM)
RATIO
*
Azithromycin tissue concentrations were originally determined using 250 mg capsules.
Sample was obtained 2–4 hours after the first dose.
Sample was obtained 10–12 hours after the first dose.
§
Dosing regimen of two doses of 250 mg each, separated by 12 hours.
Sample was obtained 19 hours after a single 500 mg dose.
SKIN 72–96 0.4 0.012 35
LUNG 72–96 4.0 0.012 >100
SPUTUM 2–4 1.0 0.64       2
SPUTUM 10–12 2.9 0.1     30
TONSIL§ 9–18 4.5 0.03 >100
TONSIL§ 180 0.9 0.006 >100
CERVIX 19 2.8 0.04     70

The extensive tissue distribution was confirmed by examination of additional tissues and fluids (bone, ejaculum, prostate, ovary, uterus, salpinx, stomach, liver, and gallbladder). As there are no data from adequate and well-controlled studies of azithromycin treatment of infections in these additional body sites, the clinical importance of these tissue concentration data is unknown.

Following a regimen of 500 mg on the first day and 250 mg daily for 4 days, only very low concentrations were noted in cerebrospinal fluid (less than 0.01 µg/mL) in the presence of non-inflamed meninges.

Metabolism

In vitro and in vivo studies to assess the metabolism of azithromycin have not been performed.

Elimination

Plasma concentrations of azithromycin following single 500 mg oral and i.v. doses declined in a polyphasic pattern with a mean apparent plasma clearance of 630 mL/min and terminal elimination half-life of 68 hours. The prolonged terminal half-life is thought to be due to extensive uptake and subsequent release of drug from tissues.

Biliary excretion of azithromycin, predominantly as unchanged drug, is a major route of elimination. Over the course of a week, approximately 6% of the administered dose appears as unchanged drug in urine.

Special Populations

Renal Insufficiency

Azithromycin pharmacokinetics were investigated in 42 adults (21 to 85 years of age) with varying degrees of renal impairment. Following the oral administration of a single 1,000 mg dose of azithromycin, mean Cmax and AUC0–120 increased by 5.1% and 4.2%, respectively in subjects with mild to moderate renal impairment (GFR 10 to 80 mL/min) compared to subjects with normal renal function (GFR >80 mL/min). The mean Cmax and AUC0–120 increased 61% and 35%, respectively in subjects with severe renal impairment (GFR <10 mL/min) compared to subjects with normal renal function (GFR >80 mL/min). (See DOSAGE AND ADMINISTRATION.)

Hepatic Insufficiency

The pharmacokinetics of azithromycin in subjects with hepatic impairment have not been established.

Gender

There are no significant differences in the disposition of azithromycin between male and female subjects. No dosage adjustment is recommended based on gender.

Geriatric Patients

When studied in healthy elderly subjects aged 65 to 85 years, the pharmacokinetic parameters of azithromycin in elderly men were similar to those in young adults; however, in elderly women, although higher peak concentrations (increased by 30 to 50%) were observed, no significant accumulation occurred.

Pediatric Patients

In two clinical studies, azithromycin for oral suspension was dosed at 10 mg/kg on day 1, followed by 5 mg/kg on days 2 through 5 to two groups of pediatric patients (aged 1–5 years and 5–15 years, respectively). The mean pharmacokinetic parameters on day 5 were Cmax=0.216 µg/mL, Tmax=1.9 hours, and AUC0–24=1.822 µg∙hr/mL for the 1- to 5-year-old group and were Cmax=0.383 µg/mL, Tmax=2.4 hours, and AUC0–24=3.109 µg∙hr/mL for the 5- to 15-year-old group.

Two clinical studies were conducted in 68 pediatric patients aged 3–16 years to determine the pharmacokinetics and safety of azithromycin for oral suspension. Azithromycin was administered following a low-fat breakfast.

The first study consisted of 35 pediatric patients treated with 20 mg/kg/day (maximum daily dose 500 mg) for 3 days of whom 34 patients were evaluated for pharmacokinetics.

In the second study, 33 pediatric patients received doses of 12 mg/kg/day (maximum daily dose 500 mg) for 5 days of whom 31 patients were evaluated for pharmacokinetics.

In both studies, azithromycin concentrations were determined over a 24 hour period following the last daily dose. Patients weighing above 25.0 kg in the 3-day study or 41.7 kg in the 5-day study received the maximum adult daily dose of 500 mg. Eleven patients (weighing 25.0 kg or less) in the first study and 17 patients (weighing 41.7 kg or less) in the second study received a total dose of 60 mg/kg. The following table shows pharmacokinetic data in the subset of pediatric patients who received a total dose of 60 mg/kg.

Pharmacokinetic Parameter
[mean (SD)]
3-Day Regimen
(20 mg/kg × 3 days)
5-Day Regimen
(12 mg/kg × 5 days)
n 11 17
Cmax (µg/mL) 1.1 (0.4) 0.5 (0.4)
Tmax (hr) 2.7 (1.9) 2.2 (0.8)
AUC0–24(µg∙hr/mL) 7.9 (2.9) 3.9 (1.9)

The similarity of the overall exposure (AUC0–∞) between the 3-day and 5-day regimens in pediatric patients is unknown.

Single dose pharmacokinetics in pediatric patients given doses of 30 mg/kg have not been studied. (See DOSAGE AND ADMINISTRATION.)

Drug-Drug Interactions

Drug interaction studies were performed with azithromycin and other drugs likely to be co-administered. The effects of co-administration of azithromycin on the pharmacokinetics of other drugs are shown in Table 1 and the effect of other drugs on the pharmacokinetics of azithromycin are shown in Table 2.

Co-administration of azithromycin at therapeutic doses had a modest effect on the pharmacokinetics of the drugs listed in Table 1. No dosage adjustment of drugs listed in Table 1 is recommended when co-administered with azithromycin.

Co-administration of azithromycin with efavirenz or fluconazole had a modest effect on the pharmacokinetics of azithromycin. Nelfinavir significantly increased the Cmax and AUC of azithromycin. No dosage adjustment of azithromycin is recommended when administered with drugs listed in Table 2. (See PRECAUTIONS - Drug Interactions.)

Table 1. Drug Interactions: Pharmacokinetic Parameters for Co-administered Drugs in the Presence of Azithromycin
Co-administered Drug Dose of Co-administered Drug Dose of Azithromycin n Ratio (with/without azithromycin) of Co-administered Drug Pharmacokinetic Parameters (90% CI); No Effect = 1.00
Mean Cmax Mean AUC
NA - Not Available
Mean rifabutin concentrations one-half day after the last dose of rifabutin were 60 ng/mL when co-administered with azithromycin and 71 ng/mL when co-administered with placebo.
*
- 90% Confidence interval not reported
Atorvastatin 10 mg/day × 8 days 500 mg/day PO on days 6–8 12 0.83
(0.63 to 1.08)
1.01
(0.81 to 1.25)
Carbamazepine 200 mg/day × 2 days, then 200 mg BID × 18 days 500 mg/day PO for days 16–18 7 0.97
(0.88 to 1.06)
0.96
(0.88 to 1.06)
Cetirizine 20 mg/day × 11 days 500 mg PO on day 7, then 250 mg/day on days 8–11 14 1.03
(0.93 to 1.14)
1.02
(0.92 to 1.13)
Didanosine 200 mg PO BID × 21 days 1,200 mg/day PO on days 8–21 6 1.44
(0.85 to 2.43)
1.14
(0.83 to 1.57)
Efavirenz 400 mg/day × 7 days 600 mg PO on day 7 14 1.04* 0.95*
Fluconazole 200 mg PO single dose 1,200 mg PO single dose 18 1.04
(0.98 to 1.11)
1.01
(0.97 to 1.05)
Indinavir 800 mg TID × 5 days 1,200 mg PO on day 5 18 0.96
(0.86 to 1.08)
0.90
(0.81 to 1.00)
Midazolam 15 mg PO on day 3 500 mg/day PO × 3 days 12 1.27
(0.89 to 1.81)
1.26
(1.01 to 1.56)
Nelfinavir 750 mg TID × 11 days 1,200 mg PO on day 9 14 0.90
(0.81 to 1.01)
0.85
(0.78 to 0.93)
Rifabutin 300 mg/day × 10 days 500 mg PO on day 1, then 250 mg/day on days 2–10 6 See footnote below NA
Sildenafil 100 mg on days 1 and 4 500 mg/day PO × 3 days 12 1.16
(0.86 to 1.57)
0.92
(0.75 to 1.12)
Theophylline 4 mg/kg IV on days 1, 11, 25 500 mg PO on day 7, 250 mg/day on days 8–11 10 1.19
(1.02 to 1.40)
1.02
(0.86 to 1.22)
Theophylline 300 mg PO BID × 15 days 500 mg PO on day 6, then 250 mg/day on days 7–10 8 1.09
(0.92 to 1.29)
1.08
(0.89 to 1.31)
Triazolam 0.125 mg on day 2 500 mg PO on day 1, then 250 mg/day on day 2 12 1.06* 1.02*
Trimethoprim/Sulfamethoxazole 160 mg/800 mg/day PO × 7 days 1,200 mg PO on day 7 12 0.85
(0.75 to 0.97)/
0.90
(0.78 to 1.03)
0.87
(0.80 to 0.95/
0.96
(0.88 to 1.03)
Zidovudine 500 mg/day PO × 21 days 600 mg/day PO × 14 days 5 1.12
(0.42 to 3.02)
0.94
(0.52 to 1.70)
Zidovudine 500 mg/day PO × 21 days 1,200 mg/day PO × 14 days 4 1.31
(0.43 to 3.97)
1.30
(0.69 to 2.43)
Table 2. Drug Interactions: Pharmacokinetic Parameters for Azithromycin in the Presence of Co-administered Drugs (See PRECAUTIONS - Drug Interactions.)
Co-administered Drug Dose of Co-administered Drug Dose of Azithromycin n Ratio (with/without co-administered drug) of Azithromycin Pharmacokinetic Parameters (90% CI); No Effect = 1.00
Mean Cmax Mean AUC
NA – Not available
Mean azithromycin concentrations one day after the last dose were 53 ng/mL when coadministered with 300 mg daily rifabutin and 49 ng/mL when coadministered with placebo.
*
- 90% Confidence interval not reported
Efavirenz 400 mg/day × 7 days 600 mg PO on day 7 14 1.22
(1.04 to 1.42)
0.92*
Fluconazole 200 mg PO single dose 1,200 mg PO single dose 18 0.82
(0.66 to 1.02)
1.07
(0.94 to 1.22)
Nelfinavir 750 mg TID × 11 days 1,200 mg PO on day 9 14 2.36
(1.77 to 3.15)
2.12
(1.80 to 2.50)
Rifabutin 300 mg/day × 10 days 500 mg PO on day 1, then 250 mg/day on days 2–10 6 See footnote below NA

Pharmacodynamics

Cardiac Electrophysiology

QTc interval prolongation was studied in a randomized, placebo-controlled parallel trial in 116 healthy subjects who received either chloroquine (1000 mg) alone or in combination with azithromycin (500 mg, 1000 mg, and 1500 mg once daily). Co-administration of azithromycin increased the QTc interval in a dose- and concentration-dependent manner. In comparison to chloroquine alone, the maximum mean (95% upper confidence bound) increases in QTcF were 5 (10) ms, 7 (12) ms and 9 (14) ms with the co-administration of 500 mg, 1000 mg and 1500 mg azithromycin, respectively.

Microbiology

Mechanism of Action

Azithromycin binds to the 23S rRNA of the bacterial 50S ribosomal subunit. It blocks protein synthesis by inhibiting the transpeptidation/translocation step of protein synthesis and by inhibiting the assembly of the 50S ribosomal subunit.

Azithromycin concentrates in phagocytes and fibroblasts as demonstrated by in vitro incubation techniques.The ratio of intracellular to extracellular concentration was >30 after one hour incubation. In vivo studies suggest that concentration in phagocytes may contribute to drug distribution to inflamed tissues.

Mechanism of Resistance

The most frequently encountered mechanism of resistance to azithromycin is modification of the 23S rRNA at positions corresponding to A2058 and A2059 in the Escherichia coli numbering system. In addition to cross resistance with other macrolides (erythromycin and clarithromycin), ribosomal modification may determine resistance to other antibiotic classes (lincosamides and streptogramins B) that bind to overlapping ribosomal sites.

Azithromycin has been shown to be active against most isolates of the following bacteria, both in vitro and in clinical infections [see INDICATIONS AND USAGE].

Gram-positive bacteria

 
Staphylococcus aureus
 
Streptococcus agalactiae
 
Streptococcus pneumoniae
 
Streptococcus pyogenes

Gram-negative bacteria

 
Haemophilus ducreyi
 
Haemophilus influenzae
 
Moraxella catarrhalis
 
Neisseria gonorrhoeae

"Other" bacteria

 
Chlamydophila pneumoniae
 
Chlamydia trachomatis
 
Mycoplasma pneumoniae

The following in vitro data are available, but their clinical significance is unknown.

At least 90% of the following bacteria exhibit an in vitro minimum inhibitory concentration (MIC) less than or equal to the azithromycin susceptible breakpoint of ≤ 4mcg/mL. However, safety and effectiveness of azithromycin in treating clinical infections due to these bacteria have not been established in adequate and well-controlled trials.

Gram-positive bacteria

 
Beta-hemolytic streptococci (Groups C, F, G)
 
Viridans group streptococci

Gram-negative bacteria

 
Bordetella pertussis

Anaerobic bacteria

 
Peptostreptococcus species
 
Prevotella bivia

"Other" bacteria

 
Ureaplasma urealyticum
 
Legionella pneumophila
Susceptibility Testing Methods

When available, the results of in vitro susceptibility test results for antimicrobial drugs used in resident hospitals should be provided to the physician as periodic reports which describe the susceptibility profile of nosocomial and community-acquired pathogens. These reports may differ from susceptibility data obtained from outpatient use, but could aid the physician in selecting the most effective antimicrobial.

Dilution Techniques

Quantitative methods are used to determine antimicrobial minimum inhibitory concentrations (MICs). These MICs provide estimates of the susceptibility of bacteria to antimicrobial compounds. The MICs should be determined using a standardized procedure. Standardized procedures are based on a dilution method1,2 (broth or agar) or equivalent with standardized inoculum concentration and standardized concentration of azithromycin powder. The MIC values should be interpreted according to criteria provided in Table 3.

Diffusion Techniques

Quantitative methods that require measurement of zone diameters also provide reproducible estimates of the susceptibility of bacteria to antimicrobial compounds. One such standardized procedure2,3 requires the use of standardized inoculum concentration. This procedure uses paper disks impregnated with 15-mcg azithromycin to test the susceptibility of bacteria to azithromycin. The disk diffusion interpretive criteria are provided in Table 3.

Table 3. Susceptibility Test Interpretive Criteria for Azithromycin
Susceptibility Test Result Interpretive Criteria
Minimum Inhibitory Concentrations (mcg/mL) Disk Diffusion
(zone diameters in mm)
Pathogen
S I R S I R
Susceptibility to azithromycin must be tested in ambient air.
*
Insufficient information is available to determine Intermediate or Resistant interpretive criteria
Haemophilus influenzae* ≤ 4 -- -- ≥ 12 -- --
Staphylococcus aureus ≤ 2 4 ≥ 8 ≥ 18 14–17 ≤ 13
Streptococci including S. pneumoniae ≤ 0.5 1 ≥ 2 ≥ 18 14–17 ≤ 13

The ability to correlate MIC values and plasma drug levels is difficult as azithromycin concentrates in macrophages and tissues [see Clinical Pharmacology].

A report of "susceptible" indicates that the pathogen is likely to be inhibited if the antimicrobial compound reaches the concentrations usually achievable. A report of "intermediate" indicates that the result should be considered equivocal, and, if the microorganism is not fully susceptible to alternative, clinically feasible drugs, the test should be repeated. This category implies possible clinical applicability in body sites where the drug is physiologically concentrated or in situations where high dosage of drug can be used. This category also provides a buffer zone which prevents small uncontrolled technical factors from causing major discrepancies in interpretation. A report of "resistant" indicates that the pathogen is not likely to be inhibited if the antimicrobial compound reaches the concentrations usually achievable; other therapy should be selected.

Quality Control

Standardized susceptibility test procedures require the use of laboratory controls to monitor and ensure the accuracy and precision of supplies and reagents used in the assay, and the techniques of the individual performing the test. Standard azithromycin powder should provide the following range of MIC values noted in Table 4. For the diffusion technique using the azithromycin 15 mcg disk, the criteria in Table 4 should be achieved.

Table 4. Acceptable Quality Control Ranges for Azithromycin
QC Strain Minimum Inhibitory Concentrations (mcg/mL) Disk Diffusion
(zone diameters in mm)
Susceptibility to azithromycin must be tested in ambient air.
*
ATCC = American Type Culture Collection
Haemophilus influenzae
  ATCC* 49247
1.0–4.0 13–21
Staphylococcus aureus
  ATCC 29213
0.5–2.0 ...
Staphylococcus aureus
  ATCC 25923
... 21–26
Streptococcus pneumoniae
  ATCC 49619
0.06–0.25 19–25

Indications and Usage for Zithromax

Zithromax (azithromycin) is indicated for the treatment of patients with mild to moderate infections (pneumonia: see WARNINGS) caused by susceptible strains of the designated microorganisms in the specific conditions listed below. As recommended dosages, durations of therapy and applicable patient populations vary among these infections, please see DOSAGE AND ADMINISTRATION for specific dosing recommendations.

Adults

Acute bacterial exacerbations of chronic obstructive pulmonary disease due to Haemophilus influenzae, Moraxella catarrhalis or Streptococcus pneumoniae.

Acute bacterial sinusitis due to Haemophilus influenzae, Moraxella catarrhalis or Streptococcus pneumoniae.

Community-acquired pneumonia due to Chlamydophila pneumoniae, Haemophilus influenzae, Mycoplasma pneumoniae or Streptococcus pneumoniae in patients appropriate for oral therapy.

NOTE: Azithromycin should not be used in patients with pneumonia who are judged to be inappropriate for oral therapy because of moderate to severe illness or risk factors such as any of the following:

 
patients with cystic fibrosis,
 
patients with nosocomially acquired infections,
 
patients with known or suspected bacteremia,
 
patients requiring hospitalization,
 
elderly or debilitated patients, or
 
patients with significant underlying health problems that may compromise their ability to respond to their illness (including immunodeficiency or functional asplenia).

Pharyngitis/tonsillitis caused by Streptococcus pyogenes as an alternative to first-line therapy in individuals who cannot use first-line therapy.

 
NOTE: Penicillin by the intramuscular route is the usual drug of choice in the treatment of Streptococcus pyogenes infection and the prophylaxis of rheumatic fever. Zithromax is often effective in the eradication of susceptible strains of Streptococcus pyogenes from the nasopharynx. Because some strains are resistant to Zithromax, susceptibility tests should be performed when patients are treated with Zithromax. Data establishing efficacy of azithromycin in subsequent prevention of rheumatic fever are not available.

Uncomplicated skin and skin structure infections due to Staphylococcus aureus, Streptococcus pyogenes, or Streptococcus agalactiae. Abscesses usually require surgical drainage.

Urethritis and cervicitis due to Chlamydia trachomatis or Neisseria gonorrhoeae.

Genital ulcer disease in men due to Haemophilus ducreyi (chancroid). Due to the small number of women included in clinical trials, the efficacy of azithromycin in the treatment of chancroid in women has not been established.

Zithromax, at the recommended dose, should not be relied upon to treat syphilis. Antimicrobial agents used in high doses for short periods of time to treat non-gonococcal urethritis may mask or delay the symptoms of incubating syphilis. All patients with sexually-transmitted urethritis or cervicitis should have a serologic test for syphilis and appropriate cultures for gonorrhea performed at the time of diagnosis. Appropriate antimicrobial therapy and follow-up tests for these diseases should be initiated if infection is confirmed.

Appropriate culture and susceptibility tests should be performed before treatment to determine the causative organism and its susceptibility to azithromycin. Therapy with Zithromax may be initiated before results of these tests are known; once the results become available, antimicrobial therapy should be adjusted accordingly.

To reduce the development of drug-resistant bacteria and maintain the effectiveness of Zithromax (azithromycin) and other antibacterial drugs, Zithromax (azithromycin) should be used only to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.

Pediatric Patients

(See PRECAUTIONS—Pediatric Use and CLINICAL STUDIES IN PEDIATRIC PATIENTS.)

Acute otitis media caused by Haemophilus influenzae, Moraxella catarrhalis or Streptococcus pneumoniae. (For specific dosage recommendation, see DOSAGE AND ADMINISTRATION.)

Community-acquired pneumonia due to Chlamydophila pneumoniae, Haemophilus influenzae, Mycoplasma pneumoniae or Streptococcus pneumoniae in patients appropriate for oral therapy. (For specific dosage recommendation, see DOSAGE AND ADMINISTRATION.)

NOTE: Azithromycin should not be used in pediatric patients with pneumonia who are judged to be inappropriate for oral therapy because of moderate to severe illness or risk factors such as any of the following:

 
patients with cystic fibrosis,
 
patients with nosocomially acquired infections,
 
patients with known or suspected bacteremia,
 
patients requiring hospitalization, or
 
patients with significant underlying health problems that may compromise their ability to respond to their illness (including immunodeficiency or functional asplenia).

Pharyngitis/tonsillitis caused by Streptococcus pyogenes as an alternative to first-line therapy in individuals who cannot use first-line therapy. (For specific dosage recommendation, see DOSAGE AND ADMINISTRATION.)

 
NOTE: Penicillin by the intramuscular route is the usual drug of choice in the treatment of Streptococcus pyogenes infection and the prophylaxis of rheumatic fever. Zithromax is often effective in the eradication of susceptible strains of Streptococcus pyogenes from the nasopharynx. Because some strains are resistant to Zithromax, susceptibility tests should be performed when patients are treated with Zithromax. Data establishing efficacy of azithromycin in subsequent prevention of rheumatic fever are not available.

Appropriate culture and susceptibility tests should be performed before treatment to determine the causative organism and its susceptibility to azithromycin. Therapy with Zithromax may be initiated before results of these tests are known; once the results become available, antimicrobial therapy should be adjusted accordingly.

Contraindications

Zithromax is contraindicated in patients with known hypersensitivity to azithromycin, erythromycin, any macrolide or ketolide antibiotic. Zithromax is contraindicated in patients with a history of cholestatic jaundice/hepatic dysfunction associated with prior use of azithromycin.

Warnings

Hypersensitivity

Serious allergic reactions, including angioedema, anaphylaxis, and dermatologic reactions including Stevens Johnson Syndrome and toxic epidermal necrolysis have been reported rarely in patients on azithromycin therapy. Although rare, fatalities have been reported. (See CONTRAINDICATIONS.) Despite initially successful symptomatic treatment of the allergic symptoms, when symptomatic therapy was discontinued, the allergic symptoms recurred soon thereafter in some patients without further azithromycin exposure. These patients required prolonged periods of observation and symptomatic treatment. The relationship of these episodes to the long tissue half-life of azithromycin and subsequent prolonged exposure to antigen is unknown at present.

If an allergic reaction occurs, the drug should be discontinued and appropriate therapy should be instituted. Physicians should be aware that reappearance of the allergic symptoms may occur when symptomatic therapy is discontinued.

Hepatotoxicity

Abnormal liver function, hepatitis, cholestatic jaundice, hepatic necrosis, and hepatic failure have been reported, some of which have resulted in death. Discontinue azithromycin immediately if signs and symptoms of hepatitis occur.

Treatment of pneumonia

In the treatment of pneumonia, azithromycin has only been shown to be safe and effective in the treatment of community-acquired pneumonia due to Chlamydia pneumoniae, Haemophilus influenzae, Mycoplasma pneumoniae or Streptococcus pneumoniae in patients appropriate for oral therapy. Azithromycin should not be used in patients with pneumonia who are judged to be inappropriate for oral therapy because of moderate to severe illness or risk factors such as any of the following: patients with cystic fibrosis, patients with nosocomially acquired infections, patients with known or suspected bacteremia, patients requiring hospitalization, elderly or debilitated patients, or patients with significant underlying health problems that may compromise their ability to respond to their illness (including immunodeficiency or functional asplenia).

Clostridium Difficile-associated diarrhea

Clostridium difficile associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents, including Zithromax, and may range in severity from mild diarrhea to fatal colitis. Treatment with antibacterial agents alters the normal flora of the colon leading to overgrowth of C. difficile.

C. difficile produces toxins A and B which contribute to the development of CDAD. Hypertoxin producing strains of C. difficile cause increased morbidity and mortality, as these infections can be refractory to antimicrobial therapy and may require colectomy. CDAD must be considered in all patients who present with diarrhea following antibiotic use. Careful medical history is necessary since CDAD has been reported to occur over two months after the administration of antibacterial agents.

If CDAD is suspected or confirmed, ongoing antibiotic use not directed against C. difficile may need to be discontinued. Appropriate fluid and electrolyte management, protein supplementation, antibiotic treatment of C. difficile, and surgical evaluation should be instituted as clinically indicated.

QT Prolongation

Prolonged cardiac repolarization and QT interval, imparting a risk of developing cardiac arrhythmia and torsades de pointes, have been seen in treatment with macrolides, including azithromycin. Cases of torsades de pointes have been spontaneously reported during postmarketing surveillance in patients receiving azithromycin. Providers should consider the risk of QT prolongation which can be fatal when weighing the risks and benefits of azithromycin for at-risk groups including:

  • patients with known prolongation of the QT interval, a history of torsades de pointes, congenital long QT syndrome, bradyarrhythmias or uncompensated heart failure
  • patients on drugs known to prolong the QT interval
  • patients with ongoing proarrhythmic conditions such as uncorrected hypokalemia or hypomagnesemia, clinically significant bradycardia, and in patients receiving Class IA (quinidine, procainamide) or Class III (dofetilide, aminodarone, sotalol) antiarrhythmic agents.

Elderly patients may be more susceptible to drug-associated effects on the QT interval.

Precautions

General

Because azithromycin is principally eliminated via the liver, caution should be exercised when azithromycin is administered to patients with impaired hepatic function. Due to the limited data in subjects with GFR <10 mL/min, caution should be exercised when prescribing azithromycin in these patients. (See CLINICAL PHARMACOLOGY - Special Populations - Renal Insufficiency.)

Exacerbation of symptoms of myasthenia gravis and new onset of myasthenic syndrome have been reported in patients receiving azithromycin therapy.

Prescribing Zithromax (azithromycin) in the absence of a proven or strongly suspected bacterial infection or a prophylactic indication is unlikely to provide benefit to the patient and increases the risk of the development of drug-resistant bacteria.

Information for Patients

Zithromax tablets and oral suspension can be taken with or without food.

Patients should also be cautioned not to take aluminum- and magnesium-containing antacids and azithromycin simultaneously.

The patient should be directed to discontinue azithromycin immediately and contact a physician if any signs of an allergic reaction occur.

Patients should be counseled that antibacterial drugs including Zithromax (azithromycin) should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold). When Zithromax (azithromycin) is prescribed to treat a bacterial infection, patients should be told that although it is common to feel better early in the course of the therapy, the medication should be taken exactly as directed. Skipping doses or not completing the full course of therapy may (1) decrease the effectiveness of the immediate treatment and (2) increase the likelihood that bacteria will develop resistance and will not be treatable by Zithromax (azithromycin) or other antibacterial drugs in the future.

Diarrhea is a common problem caused by antibiotics which usually ends when the antibiotic is discontinued. Sometimes after starting treatment with antibiotics, patients can develop watery and bloody stools (with or without stomach cramps and fever) even as late as two or more months after having taken the last dose of the antibiotic. If this occurs, patients should contact their physician as soon as possible.

Drug Interactions

Co-administration of nelfinavir at steady-state with a single oral dose of azithromycin resulted in increased azithromycin serum concentrations. Although a dose adjustment of azithromycin is not recommended when administered in combination with nelfinavir, close monitoring for known side effects of azithromycin, such as liver enzyme abnormalities and hearing impairment, is warranted. (See ADVERSE REACTIONS.)

Although, in a study of 22 healthy men, a 5-day course of azithromycin did not affect the prothrombin time from a subsequently administered dose of warfarin, spontaneous post-marketing reports suggest that concomitant administration of azithromycin may potentiate the effects of oral anticoagulants. Prothrombin times should be carefully monitored while patients are receiving azithromycin and oral anticoagulants concomitantly.

Drug interaction studies were performed with azithromycin and other drugs likely to be co-administered. (See CLINICAL PHARMACOLOGY-Drug-Drug Interactions.) When used in therapeutic doses, azithromycin had a modest effect on the pharmacokinetics of atorvastatin, carbamazepine, cetirizine, didanosine, efavirenz, fluconazole, indinavir, midazolam, rifabutin, sildenafil, theophylline (intravenous and oral), triazolam, trimethoprim/sulfamethoxazole or zidovudine. Co-administration with efavirenz, or fluconazole had a modest effect on the pharmacokinetics of azithromycin. No dosage adjustment of either drug is recommended when azithromycin is coadministered with any of the above agents.

Interactions with the drugs listed below have not been reported in clinical trials with azithromycin; however, no specific drug interaction studies have been performed to evaluate potential drug-drug interaction. Nonetheless, they have been observed with macrolide products. Until further data are developed regarding drug interactions when azithromycin and these drugs are used concomitantly, careful monitoring of patients is advised:

 
Digoxin–elevated digoxin concentrations.
 
Ergotamine or dihydroergotamine–acute ergot toxicity characterized by severe peripheral vasospasm and dysesthesia.
 
Terfenadine, cyclosporine, hexobarbital and phenytoin concentrations.

Laboratory Test Interactions

There are no reported laboratory test interactions.

Carcinogenesis, Mutagenesis, Impairment of Fertility

Long-term studies in animals have not been performed to evaluate carcinogenic potential. Azithromycin has shown no mutagenic potential in standard laboratory tests: mouse lymphoma assay, human lymphocyte clastogenic assay, and mouse bone marrow clastogenic assay. No evidence of impaired fertility due to azithromycin was found.

Pregnancy

Teratogenic Effects

Pregnancy Category B

Reproduction studies have been performed in rats and mice at doses up to moderately maternally toxic dose concentrations (i.e., 200 mg/kg/day). These doses, based on a mg/m2 basis, are estimated to be 4 and 2 times, respectively, the human daily dose of 500 mg. In the animal studies, no evidence of harm to the fetus due to azithromycin was found. There are, however, no adequate and well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, azithromycin should be used during pregnancy only if clearly needed.

Nursing Mothers

It is not known whether azithromycin is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when azithromycin is administered to a nursing woman.

Pediatric Use

(See CLINICAL PHARMACOLOGY, INDICATIONS AND USAGE, and DOSAGE AND ADMINISTRATION.)

Acute Otitis Media (total dosage regimen: 30 mg/kg, see DOSAGE AND ADMINISTRATION): Safety and effectiveness in the treatment of pediatric patients with otitis media under 6 months of age have not been established.

Acute Bacterial Sinusitis (dosage regimen: 10 mg/kg on Days 1–3): Safety and effectiveness in the treatment of pediatric patients with acute bacterial sinusitis under 6 months of age have not been established. Use of Zithromax for the treatment of acute bacterial sinusitis in pediatric patients (6 months of age or greater) is supported by adequate and well-controlled studies in adults, similar pathophysiology of acute sinusitis in adults and pediatric patients, and studies of acute otitis media in pediatric patients.

Community-Acquired Pneumonia (dosage regimen: 10 mg/kg on Day 1 followed by 5 mg/kg on Days 2–5): Safety and effectiveness in the treatment of pediatric patients with community-acquired pneumonia under 6 months of age have not been established. Safety and effectiveness for pneumonia due to Chlamydophila pneumoniae and Mycoplasma pneumoniae were documented in pediatric clinical trials. Safety and effectiveness for pneumonia due to Haemophilus influenzae and Streptococcus pneumoniae were not documented bacteriologically in the pediatric clinical trial due to difficulty in obtaining specimens. Use of azithromycin for these two microorganisms is supported, however, by evidence from adequate and well-controlled studies in adults.

Pharyngitis/Tonsillitis (dosage regimen: 12 mg/kg on Days 1–5): Safety and effectiveness in the treatment of pediatric patients with pharyngitis/tonsillitis under 2 years of age have not been established.

Studies evaluating the use of repeated courses of therapy have not been conducted. (See CLINICAL PHARMACOLOGY and ANIMAL TOXICOLOGY.)

Geriatric Use

Pharmacokinetic parameters in older volunteers (65–85 years old) were similar to those in younger volunteers (18–40 years old) for the 5-day therapeutic regimen. Dosage adjustment does not appear to be necessary for older patients with normal renal and hepatic function receiving treatment with this dosage regimen. (See CLINICAL PHARMACOLOGY.)

In multiple-dose clinical trials of oral azithromycin, 9% of patients were at least 65 years of age (458/4949) and 3% of patients (144/4949) were at least 75 years of age. No overall differences in safety or effectiveness were observed between these subjects and younger subjects, and other reported clinical experience has not identified differences in response between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.

Elderly patients may be more susceptible to development of torsades de pointes arrhythmia than younger patients (See WARNINGS).

Zithromax 250 mg tablets contain 0.9 mg of sodium per tablet.

Zithromax 500 mg tablets contain 1.8 mg of sodium per tablet.

Zithromax for oral suspension 100 mg/5 mL contains 3.7 mg of sodium per 5 mL of constituted solution.

Zithromax for oral suspension 200 mg/5 mL contains 7.4 mg of sodium per 5 mL of constituted solution.

Adverse Reactions

In clinical trials, most of the reported side effects were mild to moderate in severity and were reversible upon discontinuation of the drug. Potentially serious side effects of angioedema and cholestatic jaundice were reported rarely. Approximately 0.7% of the patients (adults and pediatric patients) from the 5-day multiple-dose clinical trials discontinued Zithromax (azithromycin) therapy because of treatment-related side effects. In adults given 500 mg/day for 3 days, the discontinuation rate due to treatment-related side effects was 0.6%. In clinical trials in pediatric patients given 30 mg/kg, either as a single dose or over 3 days, discontinuation from the trials due to treatment-related side effects was approximately 1%. (See DOSAGE AND ADMINISTRATION.) Most of the side effects leading to discontinuation were related to the gastrointestinal tract, e.g., nausea, vomiting, diarrhea, or abdominal pain. (See CLINICAL STUDIES IN PEDIATRIC PATIENTS.)

Clinical

Adults

Multiple-dose regimens

Overall, the most common treatment-related side effects in adult patients receiving multiple-dose regimens of Zithromax were related to the gastrointestinal system with diarrhea/loose stools (4–5%), nausea (3%) and abdominal pain (2–3%) being the most frequently reported.

No other treatment-related side effects occurred in patients on the multiple-dose regimens of Zithromax with a frequency greater than 1%. Side effects that occurred with a frequency of 1% or less included the following:

Cardiovascular: Palpitations, chest pain.

Gastrointestinal: Dyspepsia, flatulence, vomiting, melena and cholestatic jaundice.

Genitourinary: Monilia, vaginitis and nephritis.

Nervous System: Dizziness, headache, vertigo and somnolence.

General: Fatigue.

Allergic: Rash, pruritus, photosensitivity and angioedema.

Single 1-gram dose regimen

Overall, the most common side effects in patients receiving a single-dose regimen of 1 gram of Zithromax were related to the gastrointestinal system and were more frequently reported than in patients receiving the multiple-dose regimen.

Side effects that occurred in patients on the single one-gram dosing regimen of Zithromax with a frequency of 1% or greater included diarrhea/loose stools (7%), nausea (5%), abdominal pain (5%), vomiting (2%), dyspepsia (1%) and vaginitis (1%).

Single 2-gram dose regimen

Overall, the most common side effects in patients receiving a single 2-gram dose of Zithromax were related to the gastrointestinal system. Side effects that occurred in patients in this study with a frequency of 1% or greater included nausea (18%), diarrhea/loose stools (14%), vomiting (7%), abdominal pain (7%), vaginitis (2%), dyspepsia (1%) and dizziness (1%). The majority of these complaints were mild in nature.

Pediatric Patients

Single and Multiple-dose regimens

The types of side effects in pediatric patients were comparable to those seen in adults, with different incidence rates for the dosage regimens recommended in pediatric patients.

Acute Otitis Media: For the recommended total dosage regimen of 30 mg/kg, the most frequent side effects (≥1%) attributed to treatment were diarrhea, abdominal pain, vomiting, nausea and rash. (See DOSAGE AND ADMINISTRATION and CLINICAL STUDIES IN PEDIATRIC PATIENTS.)

The incidence, based on dosing regimen, is described in the table below:

Dosage
Regimen
Diarrhea, % Abdominal
Pain, %
Vomiting, % Nausea, % Rash, %
1-day 4.3% 1.4% 4.9% 1.0% 1.0%
3-day 2.6% 1.7% 2.3% 0.4% 0.6%
5-day 1.8% 1.2% 1.1% 0.5% 0.4%
Community-Acquired Pneumonia

For the recommended dosage regimen of 10 mg/kg on Day 1 followed by 5 mg/kg on Days 2–5, the most frequent side effects attributed to treatment were diarrhea/loose stools, abdominal pain, vomiting, nausea and rash.

The incidence is described in the table below:

Dosage
Regimen
Diarrhea/Loose stools, % Abdominal
Pain, %
Vomiting, % Nausea, % Rash, %
5-day 5.8% 1.9% 1.9% 1.9% 1.6%
Pharyngitis/tonsillitis

For the recommended dosage regimen of 12 mg/kg on Days 1–5, the most frequent side effects attributed to treatment were diarrhea, vomiting, abdominal pain, nausea and headache.

The incidence is described in the table below:

Dosage
Regimen
Diarrhea, % Abdominal Pain, % Vomiting, % Nausea, % Rash, % Headache, %
5-day 5.4% 3.4% 5.6% 1.8% 0.7% 1.1%

With any of the treatment regimens, no other treatment-related side effects occurred in pediatric patients treated with Zithromax with a frequency greater than 1%. Side effects that occurred with a frequency of 1% or less included the following:

Cardiovascular: Chest pain.

Gastrointestinal: Dyspepsia, constipation, anorexia, enteritis, flatulence, gastritis, jaundice, loose stools and oral moniliasis.

Hematologic and Lymphatic: Anemia and leukopenia.

Nervous System: Headache (otitis media dosage), hyperkinesia, dizziness, agitation, nervousness and insomnia.

General: Fever, face edema, fatigue, fungal infection, malaise and pain.

Allergic: Rash and allergic reaction.

Respiratory: Cough increased, pharyngitis, pleural effusion and rhinitis.

Skin and Appendages: Eczema, fungal dermatitis, pruritus, sweating, urticaria and vesiculobullous rash.

Special Senses: Conjunctivitis.

Post-Marketing Experience

Adverse events reported with azithromycin during the post-marketing period in adult and/or pediatric patients for which a causal relationship may not be established include:

Allergic: Arthralgia, edema, urticaria and angioedema.

Cardiovascular: Arrhythmias including ventricular tachycardia and hypotension. There have been rare reports of QT prolongation and torsades de pointes.

Gastrointestinal: Anorexia, constipation, dyspepsia, flatulence, vomiting/diarrhea rarely resulting in dehydration, pseudomembranous colitis, pancreatitis, oral candidiasis, pyloric stenosis, and rare reports of tongue discoloration.

General: Asthenia, paresthesia, fatigue, malaise and anaphylaxis (rarely fatal).

Genitourinary: Interstitial nephritis and acute renal failure and vaginitis.

Hematopoietic: Thrombocytopenia.

Liver/Biliary: Adverse reactions related to hepatic dysfunction have been reported in postmarketing experience with azithromycin. (See WARNINGS, Hepatotoxicity.)

Nervous System: Convulsions, dizziness/vertigo, headache, somnolence, hyperactivity, nervousness, agitation and syncope.

Psychiatric: Aggressive reaction and anxiety.

Skin/Appendages: Pruritus, rarely serious skin reactions including erythema multiforme, Stevens Johnson Syndrome and toxic epidermal necrolysis.

Special Senses: Hearing disturbances including hearing loss, deafness and/or tinnitus and reports of taste/smell perversion and/or loss.

Laboratory Abnormalities

Adults

Clinically significant abnormalities (irrespective of drug relationship) occurring during the clinical trials were reported as follows: with an incidence of greater than 1%: decreased hemoglobin, hematocrit, lymphocytes, neutrophils and blood glucose; elevated serum creatine phosphokinase, potassium, ALT, GGT, AST, BUN, creatinine, blood glucose, platelet count, lymphocytes, neutrophils and eosinophils; with an incidence of less than 1%: leukopenia, neutropenia, decreased sodium, potassium, platelet count, elevated monocytes, basophils, bicarbonate, serum alkaline phosphatase, bilirubin, LDH and phosphate. The majority of subjects with elevated serum creatinine also had abnormal values at baseline.

When follow-up was provided, changes in laboratory tests appeared to be reversible.

In multiple-dose clinical trials involving more than 5000 patients, four patients discontinued therapy because of treatment-related liver enzyme abnormalities and one because of a renal function abnormality.

Pediatric Patients

One, Three and Five Day Regimens

Laboratory data collected from comparative clinical trials employing two 3-day regimens (30 mg/kg or 60 mg/kg in divided doses over 3 days), or two 5-day regimens (30 mg/kg or 60 mg/kg in divided doses over 5 days) were similar for regimens of azithromycin and all comparators combined, with most clinically significant laboratory abnormalities occurring at incidences of 1–5%. Laboratory data for patients receiving 30 mg/kg as a single dose were collected in one single center trial. In that trial, an absolute neutrophil count between 500–1500 cells/mm3 was observed in 10/64 patients receiving 30 mg/kg as a single dose, 9/62 patients receiving 30 mg/kg given over 3 days, and 8/63 comparator patients. No patient had an absolute neutrophil count <500 cells/mm3. (See DOSAGE AND ADMINISTRATION.)

In multiple-dose clinical trials involving approximately 4700 pediatric patients, no patients discontinued therapy because of treatment-related laboratory abnormalities.

Zithromax Dosage and Administration

(See INDICATIONS AND USAGE and CLINICAL PHARMACOLOGY.)

Adults

Infection* Recommended Dose/Duration of Therapy
*
DUE TO THE INDICATED ORGANISMS (See INDICATIONS AND USAGE.)
Community-aquired pneumonia (mild severity)
Pharyngitis/tonsillitis (second line therapy)
Skin/skin structure (uncomplicated)
500 mg as a single dose on Day 1, followed by 250 mg once daily on Days 2 through 5.
Acute bacterial exacerbations of chronic
obstructive pulmonary disease (mild to moderate)
500 mg QD × 3 days
OR
500 mg as a single dose on Day 1, followed by 250 mg once daily on Days 2 through 5.
Acute bacterial sinusitis 500 mg QD × 3 days
Genital ulcer disease (chancroid) One single 1 gram dose
Non-gonoccocal urethritis and cervicitis One single 1 gram dose
Gonococcal urethritis and cervicitis One single 2 gram dose

Zithromax tablets can be taken with or without food.

Renal Insufficiency

No dosage adjustment is recommended for subjects with renal impairment (GFR ≤80 mL/min). The mean AUC0–120 was similar in subjects with GFR 10–80 mL/min compared to subjects with normal renal function, whereas it increased 35% in subjects with GFR <10 mL/min compared to subjects with normal renal function. Caution should be exercised when azithromycin is administered to subjects with severe renal impairment. (See CLINICAL PHARMACOLOGY, Special Populations, Renal Insufficiency.)

Hepatic Insufficiency

The pharmacokinetics of azithromycin in subjects with hepatic impairment have not been established. No dose adjustment recommendations can be made in patients with impaired hepatic function (See CLINICAL PHARMACOLOGY, Special Populations, Hepatic Insufficiency.)

No dosage adjustment is recommended based on age or gender. (See CLINICAL PHARMACOLOGY, Special Populations.)

Pediatric Patients

Zithromax for oral suspension can be taken with or without food.

Acute Otitis Media

The recommended dose of Zithromax for oral suspension for the treatment of pediatric patients with acute otitis media is 30 mg/kg given as a single dose or 10 mg/kg once daily for 3 days or 10 mg/kg as a single dose on the first day followed by 5 mg/kg/day on Days 2 through 5. (See chart below.)

Acute Bacterial Sinusitis

The recommended dose of Zithromax for oral suspension for the treatment of pediatric patients with acute bacterial sinusitis is 10 mg/kg once daily for 3 days. (See chart below.)

Community-Acquired Pneumonia

The recommended dose of Zithromax for oral suspension for the treatment of pediatric patients with community-acquired pneumonia is 10 mg/kg as a single dose on the first day followed by 5 mg/kg on Days 2 through 5. (See chart below.)


PEDIATRIC DOSAGE GUIDELINES FOR OTITIS MEDIA, ACUTE BACTERIAL SINUSITIS AND COMMUNITY-ACQUIRED PNEUMONIA (Age 6 months and above, see PRECAUTIONS—Pediatric Use.) Based on Body Weight

OTITIS MEDIA AND COMMUNITY-ACQUIRED PNEUMONIA: (5-Day Regimen)*
Dosing Calculated on 10 mg/kg/day Day 1 and 5 mg/kg/day Days 2 to 5.
Weight 100 mg/5 mL 200 mg/5 mL Total mL per Treatment Course Total mg per Treatment Course
Kg Lbs. Day 1 Days 2–5 Day 1 Days 2–5
*
Effectiveness of the 3-day or 1-day regimen in pediatric patients with community-acquired pneumonia has not been established.
5 11 2.5 mL
(½ tsp)
1.25 mL
(¼ tsp)
7.5 mL 150 mg
10 22 5 mL
(1 tsp)
2.5 mL
(½ tsp)
15 mL 300 mg
20 44 5 mL
(1 tsp)
2.5 mL
(½ tsp)
15 mL 600 mg
30 66 7.5 mL
(1½ tsp)
3.75 mL
(¾ tsp)
22.5 mL 900 mg
40 88 10 mL
(2 tsp)
5 mL
(1 tsp)
30 mL 1200 mg
50 and above 110 and above 12.5 mL
(2½ tsp)
6.25 mL
(1¼ tsp)
37.5 mL 1500 mg
OTITIS MEDIA AND ACUTE BACTERIAL SINUSITIS: (3-Day Regimen)*
Dosing Calculated on 10 mg/kg/day
Weight 100 mg/5 mL 200 mg/5 mL Total mL per Treatment Course Total mg per Treatment Course
Kg Lbs. Day 1–3 Day 1–3
*
Effectiveness of the 5-day or 1-day regimen in pediatric patients with acute bacterial sinusitis has not been established.
5 11 2.5 mL
(1/2 tsp)
7.5 mL 150 mg
10 22 5 mL
(1 tsp)
15 mL 300 mg
20 44 5 mL
(1 tsp)
15 mL 600 mg
30 66 7.5 mL
(1 ½ tsp)
22.5 mL 900 mg
40 88 10 mL
(2 tsp)
30 mL 1200 mg
50 and above 110 and above 12.5 mL
(2 ½ tsp)
37.5 mL 1500 mg
OTITIS MEDIA: (1-Day Regimen)
Dosing Calculated on 30 mg/kg as a single dose
Weight 200 mg/5 mL Total mL per Treatment Course Total mg per Treatment Course
Kg Lbs. Day 1
5 11 3.75 mL
(3/4 tsp)
3.75 mL
150 mg
10 22 7.5 mL
(1 ½ tsp)
7.5 mL 300 mg
20 44 15 mL
(3 tsp)
15 mL 600 mg
30 66 22.5 mL
(4 ½ tsp)
22.5 mL 900 mg
40 88 30 mL
(6 tsp)
30 mL 1200 mg
50 and above 110 and above 37.5 mL
(7 ½ tsp)
37.5 mL 1500 mg

The safety of re-dosing azithromycin in pediatric patients who vomit after receiving 30 mg/kg as a single dose has not been established. In clinical studies involving 487 patients with acute otitis media given a single 30 mg/kg dose of azithromycin, eight patients who vomited within 30 minutes of dosing were re-dosed at the same total dose.

Pharyngitis/Tonsillitis

The recommended dose of Zithromax for children with pharyngitis/tonsillitis is 12 mg/kg once daily for 5 days. (See chart below.)


PEDIATRIC DOSAGE GUIDELINES FOR PHARYNGITIS/TONSILLITIS (Age 2 years and above, see PRECAUTIONS—Pediatric Use.) Based on Body Weight

PHARYNGITIS/TONSILLITIS: (5-Day Regimen)
Dosing Calculated on 12 mg/kg/day for 5 days.
Weight 200 mg/5 mL Total mL per Treatment Course Total mg per Treatment Course
Kg Lbs. Day 1–5
8 18 2.5 mL
(½ tsp)
12.5 mL 500 mg
17 37 5 mL
(1 tsp)
25 mL 1000 mg
25 55 7.5 mL
(1½ tsp)
37.5 mL 1500 mg
33 73 10 mL
(2 tsp)
50 mL 2000 mg
40 88 12.5 mL
(2½ tsp)
62.5 mL 2500 mg

Constituting instructions for Zithromax Oral Suspension, 300, 600, 900, 1200 mg bottles. The table below indicates the volume of water to be used for constitution:

Amount of water to be added Total volume after constitution (azithromycin content) Azithromycin concentration after constitution
9 mL (300 mg) 15 mL (300 mg) 100 mg/5 mL
9 mL (600 mg) 15 mL (600 mg) 200 mg/5 mL
12 mL (900 mg) 22.5 mL (900 mg) 200 mg/5 mL
15 mL (1200 mg) 30 mL (1200 mg) 200 mg/5 mL

Shake well before each use. Oversized bottle provides shake space. Keep tightly closed.

After mixing, store suspension at 5° to 30°C (41° to 86°F) and use within 10 days. Discard after full dosing is completed.

How is Zithromax Supplied

Zithromax 250 mg tablets are supplied as pink modified capsular shaped, engraved, film-coated tablets containing azithromycin dihydrate equivalent to 250 mg of azithromycin. Zithromax 250 mg tablets are engraved with "PFIZER" on one side and "306" on the other. These are packaged in bottles and blister cards of 6 tablets (Z-PAKS®) as follows:

Bottles of 30 NDC 0069-3060-30
Boxes of 3 (Z-PAKS® of 6) NDC 0069-3060-75
Unit Dose package of 50 NDC 0069-3060-86

Zithromax 500 mg tablets are supplied as pink modified capsular shaped, engraved, film-coated tablets containing azithromycin dihydrate equivalent to 500 mg of azithromycin. Zithromax 500 mg tablets are engraved with "Pfizer" on one side and "ZTM500" on the other. These are packaged in bottles and blister cards of 3 tablets (TRI-PAKS™) as follows:

Bottles of 30 NDC 0069-3070-30
Boxes of 3 (TRI-PAKS™ of 3 tablets) NDC 0069-3070-75
Unit Dose package of 50 NDC 0069-3070-86

Zithromax tablets should be stored between 15° to 30°C (59° to 86°F).

Zithromax for oral suspension after constitution contains a flavored suspension. Zithromax for oral suspension is supplied to provide 100 mg/5 mL or 200 mg/5 mL suspension in bottles as follows:

Azithromycin contents per bottle NDC
  300 mg 0069-3110-19
  600 mg 0069-3120-19
  900 mg 0069-3130-19
1200 mg 0069-3140-19

See DOSAGE AND ADMINISTRATION for constitution instructions with each bottle type.

Storage

Store dry powder below 30°C (86°F). Store constituted suspension between 5° to 30°C (41° to 86°F) and discard when full dosing is completed.

Clinical Studies

(See INDICATIONS AND USAGE and Pediatric Use.)

Pediatric Patients

From the perspective of evaluating pediatric clinical trials, Days 11–14 were considered on-therapy evaluations because of the extended half-life of azithromycin. Day 11–14 data are provided for clinical guidance. Day 24–32 evaluations were considered the primary test of cure endpoint.

Acute Otitis Media

Safety and efficacy using azithromycin 30 mg/kg given over 5 days

Protocol 1

In a double-blind, controlled clinical study of acute otitis media performed in the United States, azithromycin (10 mg/kg on Day 1 followed by 5 mg/kg on Days 2–5) was compared to amoxicillin/clavulanate potassium (4:1). For the 553 patients who were evaluated for clinical efficacy, the clinical success rate (i.e., cure plus improvement) at the Day 11 visit was 88% for azithromycin and 88% for the control agent. For the 521 patients who were evaluated at the Day 30 visit, the clinical success rate was 73% for azithromycin and 71% for the control agent.

In the safety analysis of the above study, the incidence of treatment-related adverse events, primarily gastrointestinal, in all patients treated was 9% with azithromycin and 31% with the control agent. The most common side effects were diarrhea/loose stools (4% azithromycin vs. 20% control), vomiting (2% azithromycin vs. 7% control), and abdominal pain (2% azithromycin vs. 5% control).

Protocol 2

In a non-comparative clinical and microbiologic trial performed in the United States, where significant rates of beta-lactamase producing organisms (35%) were found, 131 patients were evaluable for clinical efficacy. The combined clinical success rate (i.e., cure and improvement) at the Day 11 visit was 84% for azithromycin. For the 122 patients who were evaluated at the Day 30 visit, the clinical success rate was 70% for azithromycin.

Microbiologic determinations were made at the pre-treatment visit. Microbiology was not reassessed at later visits. The following presumptive bacterial/clinical cure outcomes (i.e., clinical success) were obtained from the evaluable group:

Presumed Bacteriologic Eradication
Day 11 Day 30
Azithromycin Azithromycin
S. pneumoniae 61/74 (82%) 40/56 (71%)
H. influenzae 43/54 (80%) 30/47 (64%)
M. catarrhalis 28/35 (80%) 19/26 (73%)
S. pyogenes 11/11 (100%) 7/7
Overall 177/217 (82%) 97/137 (73%)

In the safety analysis of this study, the incidence of treatment-related adverse events, primarily gastrointestinal, in all patients treated was 9%. The most common side effect was diarrhea (4%).

Protocol 3

In another controlled comparative clinical and microbiologic study of otitis media performed in the United States, azithromycin was compared to amoxicillin/clavulanate potassium (4:1). This study utilized two of the same investigators as Protocol 2 (above), and these two investigators enrolled 90% of the patients in Protocol 3. For this reason, Protocol 3 was not considered to be an independent study. Significant rates of beta-lactamase producing organisms (20%) were found. Ninety-two (92) patients were evaluable for clinical and microbiologic efficacy. The combined clinical success rate (i.e., cure and improvement) of those patients with a baseline pathogen at the Day 11 visit was 88% for azithromycin vs. 100% for control; at the Day 30 visit, the clinical success rate was 82% for azithromycin vs. 80% for control.

Microbiologic determinations were made at the pre-treatment visit. Microbiology was not reassessed at later visits. At the Day 11 and Day 30 visits, the following presumptive bacterial/clinical cure outcomes (i.e., clinical success) were obtained from the evaluable group:

Presumed Bacteriologic Eradication
Day 11 Day 30
Azithromycin Control Azithromycin Control
S. pneumoniae 25/29 (86%) 26/26 (100%) 22/28 (79%) 18/22 (82%)
H. influenzae 9/11 (82%) 9/9 8/10 (80%) 6/8
M. catarrhalis 7/7 5/5 5/5 2/3
S. pyogenes 2/2 5/5 2/2 4/4
Overall 43/49 (88%) 45/45 (100%) 37/45 (82%) 30/37 (81%)

In the safety analysis of the above study, the incidence of treatment-related adverse events, primarily gastrointestinal, in all patients treated was 4% with azithromycin and 31% with the control agent. The most common side effect was diarrhea/loose stools (2% azithromycin vs. 29% control).

Safety and efficacy using azithromycin 30 mg/kg given over 3 days

Protocol 4

In a double-blind, controlled, randomized clinical study of acute otitis media in pediatric patients from 6 months to 12 years of age, azithromycin (10 mg/kg per day for 3 days) was compared to amoxicillin/clavulanate potassium (7:1) in divided doses q12h for 10 days. Each patient received active drug and placebo matched for the comparator.

For the 366 patients who were evaluated for clinical efficacy at the Day 12 visit, the clinical success rate (i.e., cure plus improvement) was 83% for azithromycin and 88% for the control agent. For the 362 patients who were evaluated at the Day 24–28 visit, the clinical success rate was 74% for azithromycin and 69% for the control agent.

In the safety analysis of the above study, the incidence of treatment-related adverse events, primarily gastrointestinal, in all patients treated was 10.6% with azithromycin and 20.0% with the control agent. The most common side effects were diarrhea/loose stools (5.9% azithromycin vs. 14.6% control), vomiting (2.1% azithromycin vs. 1.1% control), and rash (0.0% azithromycin vs. 4.3% control).

Safety and efficacy using azithromycin 30 mg/kg given as a single dose

Protocol 5

A double blind, controlled, randomized trial was performed at nine clinical centers. Pediatric patients from 6 months to 12 years of age were randomized 1:1 to treatment with either azithromycin (given at 30 mg/kg as a single dose on Day 1) or amoxicillin/clavulanate potassium (7:1), divided q12h for 10 days. Each child received active drug, and placebo matched for the comparator.

Clinical response (Cure, Improvement, Failure) was evaluated at End of Therapy (Day 12–16) and Test of Cure (Day 28–32). Safety was evaluated throughout the trial for all treated subjects. For the 321 subjects who were evaluated at End of Treatment, the clinical success rate (cure plus improvement) was 87% for azithromycin, and 88% for the comparator. For the 305 subjects who were evaluated at Test of Cure, the clinical success rate was 75% for both azithromycin and the comparator.

In the safety analysis, the incidence of treatment-related adverse events, primarily gastrointestinal, was 16.8% with azithromycin, and 22.5% with the comparator. The most common side effects were diarrhea (6.4% with azithromycin vs. 12.7% with the comparator), vomiting (4% with each agent), rash (1.7% with azithromycin vs. 5.2% with the comparator) and nausea (1.7% with azithromycin vs. 1.2% with the comparator).

Protocol 6

In a non-comparative clinical and microbiological trial, 248 patients from 6 months to 12 years of age with documented acute otitis media were dosed with a single oral dose of azithromycin (30 mg/kg on Day 1).

For the 240 patients who were evaluable for clinical modified Intent-to-Treat (MITT) analysis, the clinical success rate (i.e., cure plus improvement) at Day 10 was 89% and for the 242 patients evaluable at Day 24–28, the clinical success rate (cure) was 85%.

Presumed Bacteriologic Eradication
Day 10 Day 24–28
S. pneumoniae 70/76 (92%) 67/76 (88%)
H. influenzae 30/42 (71%) 28/44 (64%)
M. catarrhalis 10/10 (100%) 10/10 (100%)
Overall 110/128 (86%) 105/130 (81%)

In the safety analysis of this study, the incidence of treatment-related adverse events, primarily gastrointestinal, in all the subjects treated was 12.1%. The most common side effects were vomiting (5.6%), diarrhea (3.2%), and abdominal pain (1.6%).

Pharyngitis/Tonsillitis

In three double-blind controlled studies, conducted in the United States, azithromycin (12 mg/kg once a day for 5 days) was compared to penicillin V (250 mg three times a day for 10 days) in the treatment of pharyngitis due to documented Group A β-hemolytic streptococci (GABHS or S. pyogenes). Azithromycin was clinically and microbiologically statistically superior to penicillin at Day 14 and Day 30 with the following clinical success (i.e., cure and improvement) and bacteriologic efficacy rates (for the combined evaluable patient with documented GABHS):

Three U.S. Streptococcal Pharyngitis Studies
Azithromycin vs. Penicillin V
EFFICACY RESULTS
Day 14 Day 30
Bacteriologic Eradication:
  Azithromycin 323/340 (95%) 255/330 (77%)
  Penicillin V 242/332 (73%) 206/325 (63%)
Clinical Success (Cure plus improvement):
  Azithromycin 336/343 (98%) 310/330 (94%)
  Penicillin V 284/338 (84%) 241/325 (74%)

Approximately 1% of azithromycin-susceptible S. pyogenes isolates were resistant to azithromycin following therapy.

The incidence of treatment-related adverse events, primarily gastrointestinal, in all patients treated was 18% on azithromycin and 13% on penicillin. The most common side effects were diarrhea/loose stools (6% azithromycin vs. 2% penicillin), vomiting (6% azithromycin vs. 4% penicillin), and abdominal pain (3% azithromycin vs. 1% penicillin).

Adult Patients

Acute Bacterial Exacerbations of Chronic Obstructive Pulmonary Disease

In a randomized, double-blind controlled clinical trial of acute exacerbation of chronic bronchitis (AECB), azithromycin (500 mg once daily for 3 days) was compared with clarithromycin (500 mg twice daily for 10 days). The primary endpoint of this trial was the clinical cure rate at Day 21– 24. For the 304 patients analyzed in the modified intent to treat analysis at the Day 21–24 visit, the clinical cure rate for 3 days of azithromycin was 85% (125/147) compared to 82% (129/157) for 10 days of clarithromycin.

The following outcomes were the clinical cure rates at the Day 21–24 visit for the bacteriologically evaluable patients by pathogen:

Pathogen Azithromycin
(3 Days)
Clarithromycin
(10 Days)
S. pneumoniae 29/32 (91%) 21/27 (78%)
H. influenzae 12/14 (86%) 14/16 (88%)
M. catarrhalis 11/12 (92%) 12/15 (80%)

In the safety analysis of this study, the incidence of treatment-related adverse events, primarily gastrointestinal, were comparable between treatment arms (25% with azithromycin and 29% with clarithromycin). The most common side effects were diarrhea, nausea and abdominal pain with comparable incidence rates for each symptom of 5–9% between the two treatment arms. (See ADVERSE REACTIONS.)

Acute Bacterial Sinusitis

In a randomized, double blind, double-dummy controlled clinical trial of acute bacterial sinusitis, azithromycin (500 mg once daily for 3 days) was compared with amoxicillin/clavulanate (500/125 mg tid for 10 days). Clinical response assessments were made at Day 10 and Day 28. The primary endpoint of this trial was prospectively defined as the clinical cure rate at Day 28. For the 594 patients analyzed in the modified intent to treat analysis at the Day 10 visit, the clinical cure rate for 3 days of azithromycin was 88% (268/303) compared to 85% (248/291) for 10 days of amoxicillin/clavulanate. For the 586 patients analyzed in the modified intent to treat analysis at the Day 28 visit, the clinical cure rate for 3 days of azithromycin was 71.5% (213/298) compared to 71.5% (206/288), with a 97.5% confidence interval of −8.4 to 8.3, for 10 days of amoxicillin/clavulanate.

In the safety analysis of this study, the overall incidence of treatment-related adverse events, primarily gastrointestinal, was lower in the azithromycin treatment arm (31%) than in the amoxicillin/clavulanate arm (51%). The most common side effects were diarrhea (17% in the azithromycin arm vs. 32% in the amoxicillin/clavulanate arm), and nausea (7% in the azithromycin arm vs. 12% in the amoxicillin/clavulanate arm). (See ADVERSE REACTIONS).

In an open label, noncomparative study requiring baseline transantral sinus punctures the following outcomes were the clinical success rates at the Day 7 and Day 28 visits for the modified intent to treat patients administered 500 mg of azithromycin once daily for 3 days with the following pathogens:

Pathogen Azithromycin
(500 mg per day for 3 Days)
Day 7 Day28
S. pneumoniae 23/26 (88%) 21/25 (84%)
H. influenzae 28/32 (87%) 24/32 (75%)
M. catarrhalis 14/15 (93%) 13/15 (87%)

The overall incidence of treatment-related adverse events in the noncomparative study was 21% in modified intent to treat patients treated with azithromycin at 500 mg once daily for 3 days with the most common side effects being diarrhea (9%), abdominal pain (4%) and nausea (3%). (See ADVERSE REACTIONS).

Animal Toxicology

Phospholipidosis (intracellular phospholipid accumulation) has been observed in some tissues of mice, rats, and dogs given multiple doses of azithromycin. It has been demonstrated in numerous organ systems (e.g., eye, dorsal root ganglia, liver, gallbladder, kidney, spleen, and pancreas) in dogs treated with azithromycin at doses which, expressed on the basis of mg/m2, are approximately equal to the recommended adult human dose, and in rats treated at doses approximately one-sixth of the recommended adult human dose. This effect has been shown to be reversible after cessation of azithromycin treatment. Phospholipidosis has been observed to a similar extent in the tissues of neonatal rats and dogs given daily doses of azithromycin ranging from 10 days to 30 days. Based on the pharmacokinetic data, phospholipidosis has been seen in the rat (30 mg/kg dose) at observed Cmax value of 1.3 µg/mL (six times greater than the observed Cmax of 0.216 µg/mL at the pediatric dose of 10 mg/kg). Similarly, it has been shown in the dog (10 mg/kg dose) at observed Cmax value of 1.5 µg/mL (seven times greater than the observed same Cmax and drug dose in the studied pediatric population). On a mg/m2 basis, 30 mg/kg dose in the neonatal rat (135 mg/m2) and 10 mg/kg dose in the neonatal dog (79 mg/m2) are approximately 0.5 and 0.3 times, respectively, the recommended dose in the pediatric patients with an average body weight of 25 kg. Phospholipidosis, similar to that seen in the adult animals, is reversible after cessation of azithromycin treatment. The significance of these findings for animals and for humans is unknown.

REFERENCES

  1. Clinical and Laboratory Standards Institute (CLSI). Methods for Dilution Antimicrobial Susceptibility Tests for Bacteria that Grow Aerobically; Approved Standard - Ninth Edition. CLSI document M07-A9. CLSI 950 West Valley Rd, Suite 250, Wayne, PA 19087, 2012.
  2. CLSI, Performance Standards for Antimicrobial Susceptibility Testing; Twenty-Second Informational Supplement. CLSI document M100-S22. CLSI, Wayne, PA 19087, 2012.
  3. CLSI. Performance Standards for Antimicrobial Disk Susceptibility Tests; Approved Standard - Eleventh Edition. CLSI document M02-A11. CLSI, Wayne, PA 19087, 2012.

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Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC:0069-3060
Route of Administration ORAL DEA Schedule     
Active Ingredient/Active Moiety
Ingredient Name Basis of Strength Strength
AZITHROMYCIN DIHYDRATE (AZITHROMYCIN ANHYDROUS) AZITHROMYCIN ANHYDROUS 250 mg
Inactive Ingredients
Ingredient Name Strength
CALCIUM PHOSPHATE, DIBASIC, ANHYDROUS  
CROSCARMELLOSE SODIUM  
MAGNESIUM STEARATE  
SODIUM LAURYL SULFATE  
HYPROMELLOSES  
LACTOSE  
TITANIUM DIOXIDE  
TRIACETIN  
D&C RED NO. 30  
ALUMINUM OXIDE  
Product Characteristics
Color PINK Score no score
Shape OVAL (modified capsular shaped) Size 13mm
Flavor Imprint Code PFIZER;306
Contains         
Packaging
# Item Code Package Description
1 NDC:0069-3060-30 30 TABLET, FILM COATED in 1 BOTTLE
2 NDC:0069-3060-75 3 BLISTER PACK in 1 BOX
2 6 TABLET, FILM COATED in 1 BLISTER PACK
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NDA NDA050711 07/18/1996
Zithromax 
azithromycin dihydrate tablet, film coated
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Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC:0069-3070
Route of Administration ORAL DEA Schedule     
Active Ingredient/Active Moiety
Ingredient Name Basis of Strength Strength
AZITHROMYCIN DIHYDRATE (AZITHROMYCIN ANHYDROUS) AZITHROMYCIN ANHYDROUS 500 mg
Inactive Ingredients
Ingredient Name Strength
CALCIUM PHOSPHATE, DIBASIC, ANHYDROUS  
CROSCARMELLOSE SODIUM  
MAGNESIUM STEARATE  
SODIUM LAURYL SULFATE  
HYPROMELLOSES  
LACTOSE  
TITANIUM DIOXIDE  
TRIACETIN  
D&C RED NO. 30  
ALUMINUM OXIDE  
Product Characteristics
Color PINK Score no score
Shape OVAL (modified capsular shaped) Size 17mm
Flavor Imprint Code PFIZER;ZTM500
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1 NDC:0069-3070-30 30 TABLET, FILM COATED in 1 BOTTLE
2 NDC:0069-3070-75 3 BLISTER PACK in 1 CARTON
2 3 TABLET, FILM COATED in 1 BLISTER PACK
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NDA NDA050784 05/24/2002
Zithromax 
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AZITHROMYCIN DIHYDRATE (AZITHROMYCIN ANHYDROUS) AZITHROMYCIN ANHYDROUS 100 mg  in 5 mL
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Ingredient Name Strength
SUCROSE  
SODIUM PHOSPHATE, TRIBASIC, ANHYDROUS  
HYDROXYPROPYL CELLULOSE (TYPE H)  
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FD&C RED NO. 40  
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Zithromax 
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Ingredient Name Basis of Strength Strength
AZITHROMYCIN DIHYDRATE (AZITHROMYCIN ANHYDROUS) AZITHROMYCIN ANHYDROUS 200 mg  in 5 mL
Inactive Ingredients
Ingredient Name Strength
SUCROSE  
SODIUM PHOSPHATE, TRIBASIC, ANHYDROUS  
HYDROXYPROPYL CELLULOSE (TYPE H)  
XANTHAN GUM  
FD&C RED NO. 40  
Product Characteristics
Color      Score     
Shape Size
Flavor CHERRY, VANILLA, BANANA Imprint Code
Contains         
Packaging
# Item Code Package Description
1 NDC:0069-3120-19 1 BOTTLE in 1 CARTON
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NDA NDA050710 10/19/1995
Zithromax 
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Route of Administration ORAL DEA Schedule     
Active Ingredient/Active Moiety
Ingredient Name Basis of Strength Strength
AZITHROMYCIN DIHYDRATE (AZITHROMYCIN ANHYDROUS) AZITHROMYCIN ANHYDROUS 200 mg  in 5 mL
Inactive Ingredients
Ingredient Name Strength
SUCROSE  
SODIUM PHOSPHATE, TRIBASIC, ANHYDROUS  
HYDROXYPROPYL CELLULOSE (TYPE H)  
XANTHAN GUM  
FD&C RED NO. 40  
Product Characteristics
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Shape Size
Flavor CHERRY, VANILLA, BANANA Imprint Code
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NDA NDA050710 10/19/1995
Zithromax 
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Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC:0069-3140
Route of Administration ORAL DEA Schedule     
Active Ingredient/Active Moiety
Ingredient Name Basis of Strength Strength
AZITHROMYCIN DIHYDRATE (AZITHROMYCIN ANHYDROUS) AZITHROMYCIN ANHYDROUS 200 mg  in 5 mL
Inactive Ingredients
Ingredient Name Strength
SUCROSE  
SODIUM PHOSPHATE, TRIBASIC, ANHYDROUS  
HYDROXYPROPYL CELLULOSE (TYPE H)  
XANTHAN GUM  
FD&C RED NO. 40  
Product Characteristics
Color      Score     
Shape Size
Flavor CHERRY, VANILLA, BANANA Imprint Code
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1 NDC:0069-3140-19 1 BOTTLE in 1 CARTON
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NDA NDA050710 10/19/1995
Labeler - Pfizer Laboratories Div Pfizer Inc (134489525)
Registrant - Pfizer Inc (113480771)
Establishment
Name Address ID/FEI Operations
Patheon Puerto Rico, Inc 143814544 MANUFACTURE(0069-3140, 0069-3130, 0069-3120, 0069-3110, 0069-3070, 0069-3060)
Establishment
Name Address ID/FEI Operations
Pfizer Pharmaceuticals LLC 829084552 MANUFACTURE(0069-3140, 0069-3130, 0069-3120, 0069-3110, 0069-3070, 0069-3060)
Establishment
Name Address ID/FEI Operations
Pfizer Ireland Pharmaceuticals 896090987 API MANUFACTURE(0069-3140, 0069-3130, 0069-3120, 0069-3110, 0069-3070, 0069-3060)
Establishment
Name Address ID/FEI Operations
Pliva Hrvatska d.o.o. 500651871 API MANUFACTURE(0069-3140, 0069-3130, 0069-3120, 0069-3110, 0069-3070, 0069-3060), MANUFACTURE(0069-3140, 0069-3130, 0069-3120, 0069-3110, 0069-3070, 0069-3060)
Establishment
Name Address ID/FEI Operations
Pfizer Pharmaceuticals LLC 829084545 MANUFACTURE(0069-3140, 0069-3130, 0069-3120, 0069-3110)
Establishment
Name Address ID/FEI Operations
Alembic Pharmaceuticals Limited (Formulation Division) 650574671 API MANUFACTURE(0069-3140, 0069-3130, 0069-3120, 0069-3110, 0069-3070, 0069-3060), MANUFACTURE(0069-3140, 0069-3130, 0069-3120, 0069-3110, 0069-3070, 0069-3060)
Establishment
Name Address ID/FEI Operations
Alembic Limited (Plant II) 650574713 API MANUFACTURE(0069-3140, 0069-3130, 0069-3120, 0069-3110, 0069-3070, 0069-3060), MANUFACTURE(0069-3140, 0069-3130, 0069-3120, 0069-3110, 0069-3070, 0069-3060)
Revised: 04/2014
 
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