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Generic Name: amoxicillin
Dosage Form: capsules, tablets, chewable tablets, and powder for oral suspension

Amoxil®
(amoxicillin)
Capsules, Tablets, Chewable Tablets, and Powder for Oral Suspension

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

Amoxil Description

Formulations of Amoxil contain amoxicillin, a semisynthetic antibiotic, an analog of ampicillin, with a broad spectrum of bactericidal activity against many gram-positive and gram-negative microorganisms. Chemically, it is (2S,5R,6R)-6-[(R)-(-)-2-amino-2-(p - hydroxyphenyl)acetamido] - 3,3 - dimethyl - 7 - oxo - 4 - thia - 1 - azabicyclo[3.2.0]heptane - 2 - carboxylic acid trihydrate. It may be represented structurally as:

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The amoxicillin molecular formula is C16H19N3O5S•3H2O, and the molecular weight is 419.45.

Capsules and powder for oral suspension of Amoxil are intended for oral administration.

Capsules

Each capsule of Amoxil, with royal blue opaque cap and pink opaque body, contains 500 mg amoxicillin as the trihydrate. The cap and body of the 500-mg capsule are imprinted with Amoxil and 500. Inactive ingredients: D&C Red No. 28, FD&C Blue No. 1, FD&C Red No. 40, gelatin, magnesium stearate, and titanium dioxide.

Powder for Oral Suspension

Each 5 mL of reconstituted suspension contains 250 mg, or 400 mg amoxicillin as the trihydrate. Each 5 mL of the 250-mg reconstituted suspension contains 0.15 mEq (3.36 mg) of sodium; each 5 mL of the 400-mg reconstituted suspension contains 0.19 mEq (4.33 mg) of sodium.

Pediatric Drops for Oral Suspension

Each mL of reconstituted suspension contains 50 mg amoxicillin as the trihydrate and 0.03 mEq (0.69 mg) of sodium.

Amoxicillin trihydrate for oral suspension 250 mg/5 mL (or 50 mg/mL), and 400 mg/5 mL are bubble-gum-flavored pink suspensions. Inactive ingredients: FD&C Red No. 3, flavorings, silica gel, sodium benzoate, sodium citrate, sucrose, and xanthan gum.

Amoxil - Clinical Pharmacology

Amoxicillin is stable in the presence of gastric acid and is rapidly absorbed after oral administration. The effect of food on the absorption of amoxicillin from the tablets and suspension of Amoxil has been partially investigated. The 400-mg and 875-mg formulations have been studied only when administered at the start of a light meal. However, food effect studies have not been performed with the 200-mg and 500-mg formulations. Amoxicillin diffuses readily into most body tissues and fluids, with the exception of brain and spinal fluid, except when meninges are inflamed. The half-life of amoxicillin is 61.3 minutes. Most of the amoxicillin is excreted unchanged in the urine; its excretion can be delayed by concurrent administration of probenecid. In blood serum, amoxicillin is approximately 20% protein-bound.

Orally administered doses of 250-mg and 500-mg amoxicillin capsules result in average peak blood levels 1 to 2 hours after administration in the range of 3.5 mcg/mL to 5.0 mcg/mL and 5.5 mcg/mL to 7.5 mcg/mL, respectively.

Mean amoxicillin pharmacokinetic parameters from an open, two-part, single-dose crossover bioequivalence study in 27 adults comparing 875 mg of Amoxil with 875 mg of AUGMENTIN® (amoxicillin/clavulanate potassium) showed that the 875-mg tablet of Amoxil produces an AUC0-∞ of 35.4 ± 8.1 mcg•hr/mL and a Cmax of 13.8 ± 4.1 mcg/mL. Dosing was at the start of a light meal following an overnight fast.

Orally administered doses of amoxicillin suspension, 125 mg/5 mL and 250 mg/5 mL, result in average peak blood levels 1 to 2 hours after administration in the range of 1.5 mcg/mL to 3.0 mcg/mL and 3.5 mcg/mL to 5.0 mcg/mL, respectively.

Oral administration of single doses of 400-mg chewable tablets and 400 mg/5 mL suspension of Amoxil to 24 adult volunteers yielded comparable pharmacokinetic data:

Dosea AUC0-∞ (mcg•hr/mL) Cmax (mcg/mL)b
Amoxicillin

Amoxicillin

(±S.D.)

Amoxicillin

(±S.D.)
400 mg (5 mL of suspension) 17.1 (3.1) 5.92 (1.62)
400 mg (1 chewable tablet) 17.9 (2.4) 5.18 (1.64)

a  Administered at the start of a light meal.

b  Mean values of 24 normal volunteers. Peak concentrations occurred approximately 1 hour after the dose.

Detectable serum levels are observed up to 8 hours after an orally administered dose of amoxicillin. Following a 1-gram dose and utilizing a special skin window technique to determine levels of the antibiotic, it was noted that therapeutic levels were found in the interstitial fluid. Approximately 60% of an orally administered dose of amoxicillin is excreted in the urine within 6 to 8 hours.

Microbiology

Amoxicillin is similar to ampicillin in its bactericidal action against susceptible organisms during the stage of active multiplication. It acts through the inhibition of biosynthesis of cell wall mucopeptide. Amoxicillin has been shown to be active against most strains of the following microorganisms, both in vitro and in clinical infections as described in the INDICATIONS AND USAGE section.

Aerobic Gram-Positive Microorganisms

Enterococcus faecalis

Staphylococcus spp.* (β-lactamase–negative strains only)

Streptococcus pneumoniae

Streptococcus spp. (α- and β-hemolytic strains only)

*Staphylococci which are susceptible to amoxicillin but resistant to methicillin/oxacillin should be considered as resistant to amoxicillin.

Aerobic Gram-Negative Microorganisms

Escherichia coli (β-lactamase–negative strains only)

Haemophilus influenzae (β-lactamase–negative strains only)

Neisseria gonorrhoeae (β-lactamase–negative strains only)

Proteus mirabilis (β-lactamase–negative strains only)

Helicobacter

Helicobacter pylori

Susceptibility Tests

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 (broth or agar) or equivalent with standardized inoculum concentrations and standardized concentrations of ampicillin powder. Ampicillin is sometimes used to predict susceptibility of S. pneumoniae to amoxicillin; however, some intermediate strains have been shown to be susceptible to amoxicillin. Therefore, S. pneumoniae susceptibility should be tested using amoxicillin powder. The MIC values should be interpreted according to the following criteria:

For Gram-Positive Aerobes:

Enterococcus

MIC (mcg/mL)

Interpretation

≤ 8

Susceptible (S)

≥ 16

Resistant (R)

Staphylococcusa

MIC (mcg/mL)

Interpretation

≤ 0.25

Susceptible (S)

≥ 0.5

Resistant (R)

Streptococcus (except S. pneumoniae)

MIC (mcg/mL)

Interpretation

≤ 0.25

Susceptible (S)

0.5 to 4

Intermediate (I)

≥ 8

Resistant (R)

S. pneumoniaeb from non-meningitis sources.

(Amoxicillin powder should be used to determine susceptibility.)

MIC (mcg/mL)

Interpretation

≤ 2

Susceptible (S)

4

Intermediate (I)

≥ 8

Resistant (R)

NOTE: These interpretive criteria are based on the recommended doses for respiratory tract infections.

For Gram-Negative Aerobes:

Enterobacteriaceae

MIC (mcg/mL)

Interpretation

≤ 8

Susceptible (S)

16

Intermediate (I)

≥ 32

Resistant (R)

H. influenzaec

MIC (mcg/mL)

Interpretation

≤ 1

Susceptible (S)

2

Intermediate (I)

≥ 4

Resistant (R)

a Staphylococci which are susceptible to amoxicillin but resistant to methicillin/oxacillin should be considered as resistant to amoxicillin.

b These interpretive standards are applicable only to broth microdilution susceptibility tests using cation-adjusted Mueller-Hinton broth with 2-5% lysed horse blood.

c These interpretive standards are applicable only to broth microdilution test with H. influenzae using Haemophilus Test Medium (HTM).1

A report of “Susceptible” indicates that the pathogen is likely to be inhibited if the antimicrobial compound in the blood 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 in the blood reaches the concentrations usually achievable; other therapy should be selected.

Standardized susceptibility test procedures require the use of laboratory control microorganisms to control the technical aspects of the laboratory procedures. Standard ampicillin powder should provide the following MIC values:

Microorganism

MIC Range (mcg/mL)

E. coli ATCC 25922

2 to 8

E. faecalis ATCC 29212

0.5 to 2

H. influenzae ATCC 49247d

2 to 8

S. aureus ATCC 29213

0.25 to 1

Using amoxicillin to determine susceptibility:

Microorganism

MIC Range (mcg/mL)

S. pneumoniae ATCC 49619e

0.03 to 0.12

d  This quality control range is applicable to only H. influenzae ATCC 49247 tested by a broth microdilution procedure using HTM.1

e  This quality control range is applicable to only S. pneumoniae ATCC 49619 tested by the broth microdilution procedure using cation-adjusted Mueller-Hinton broth with 2-5% lysed horse blood.

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 requires the use of standardized inoculum concentrations. This procedure uses paper disks impregnated with 10 mcg ampicillin to test the susceptibility of microorganisms, except S. pneumoniae, to amoxicillin. Interpretation involves correlation of the diameter obtained in the disk test with the MIC for ampicillin.

Reports from the laboratory providing results of the standard single-disk susceptibility test with a 10-mcg ampicillin disk should be interpreted according to the following criteria:

For Gram-Positive Aerobes:

Enterococcus

Zone Diameter (mm)

Interpretation

≥ 17

Susceptible (S)

≤ 16

Resistant (R)

Staphylococcusf

Zone Diameter (mm)

Interpretation

≥ 29

Susceptible (S)

≤ 28

Resistant (R)

β-hemolytic streptococci

Zone Diameter (mm)

Interpretation

≥ 26

Susceptible (S)

19 to 25

Intermediate (I)

≤ 18

Resistant (R)

NOTE: For streptococci (other than β-hemolytic streptococci and Spneumoniae), an ampicillin MIC should be determined.

S. pneumoniae

S. pneumoniae should be tested using a 1-mcg oxacillin disk. Isolates with oxacillin zone sizes of ≥ 20 mm are susceptible to amoxicillin. An amoxicillin MIC should be determined on isolates of S. pneumoniae with oxacillin zone sizes of ≤ 19 mm.

For Gram-Negative Aerobes:

Enterobacteriaceae

Zone Diameter (mm)

Interpretation

≥ 17

Susceptible (S)

14 to 16

Intermediate (I)

≤ 13

Resistant (R)

H. influenzaeg

Zone Diameter (mm)

Interpretation

≥ 22

Susceptible (S)

19 to 21

Intermediate (I)

≤ 18

Resistant (R)

f  Staphylococci which are susceptible to amoxicillin but resistant to methicillin/oxacillin should be considered as resistant to amoxicillin.

g  These interpretive standards are applicable only to disk diffusion susceptibility tests with H. influenzae using Haemophilus Test Medium (HTM).2

Interpretation should be as stated above for results using dilution techniques.

As with standard dilution techniques, disk diffusion susceptibility test procedures require the use of laboratory control microorganisms. The 10-mcg ampicillin disk should provide the following zone diameters in these laboratory test quality control strains:

Microorganism

Zone Diameter (mm)

E. coli

ATCC 25922

16 to 22

H. influenzae

ATCC 49247h

13 to 21

S. aureus

ATCC 25923

27 to 35

Using 1-mcg oxacillin disk:

Microorganism Zone Diameter (mm)
S. pneumoniae ATCC 49619i 8 to 12

h  This quality control range is applicable to only H. influenzae ATCC 49247 tested by a disk diffusion procedure using HTM.2

i  This quality control range is applicable to only S. pneumoniae ATCC 49619 tested by a disk diffusion procedure using Mueller-Hinton agar supplemented with 5% sheep blood and incubated in 5% CO2.

Susceptibility Testing for Helicobacter pylori

In vitro susceptibility testing methods and diagnostic products currently available for determining minimum inhibitory concentrations (MICs) and zone sizes have not been standardized, validated, or approved for testing H. pylori microorganisms.

Culture and susceptibility testing should be obtained in patients who fail triple therapy. If clarithromycin resistance is found, a non-clarithromycin-containing regimen should be used.

Indications and Usage for Amoxil

Amoxil is indicated in the treatment of infections due to susceptible (ONLY β-lactamase–negative) strains of the designated microorganisms in the conditions listed below:

Infections of the ear, nose, and throat – due to Streptococcus spp. (α- and β-hemolytic strains only), S. pneumoniae, Staphylococcus spp., or H. influenzae.

Infections of the genitourinary tract – due to E. coli, P. mirabilis, or E. faecalis.

Infections of the skin and skin structure – due to Streptococcus spp. (α- and β-hemolytic strains only), Staphylococcus spp., or E. coli.

Infections of the lower respiratory tract – due to Streptococcus spp. (α- and β-hemolytic strains only), S. pneumoniae,Staphylococcus spp., or H. influenzae.

Gonorrhea, acute uncomplicated (ano-genital and urethral infections) – due to N. gonorrhoeae (males and females).

H. pylori eradication to reduce the risk of duodenal ulcer recurrence

Triple Therapy

Amoxil/clarithromycin/lansoprazole

Amoxil, in combination with clarithromycin plus lansoprazole as triple therapy, is indicated for the treatment of patients with H. pylori infection and duodenal ulcer disease (active or 1-year history of a duodenal ulcer) to eradicate H. pylori. Eradication of H. pylori has been shown to reduce the risk of duodenal ulcer recurrence. (See CLINICAL STUDIES and DOSAGE AND ADMINISTRATION.)

Dual Therapy

Amoxil/lansoprazole

Amoxil, in combination with lansoprazole delayed-release capsules as dual therapy, is indicated for the treatment of patients with H. pylori infection and duodenal ulcer disease (active or 1-year history of a duodenal ulcer) who are either allergic or intolerant to clarithromycin or in whom resistance to clarithromycin is known or suspected. (See the clarithromycin package insert, MICROBIOLOGY.) Eradication of H. pylori has been shown to reduce the risk of duodenal ulcer recurrence. (See CLINICAL STUDIES and DOSAGE AND ADMINISTRATION.)

To reduce the development of drug-resistant bacteria and maintain the effectiveness of Amoxil and other antibacterial drugs, Amoxil 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.

Indicated surgical procedures should be performed.

Contraindications

A history of allergic reaction to any of the penicillins is a contraindication.

Warnings

SERIOUS AND OCCASIONALLY FATAL HYPERSENSITIVITY (ANAPHYLACTIC) REACTIONS HAVE BEEN REPORTED IN PATIENTS ON PENICILLIN THERAPY. ALTHOUGH ANAPHYLAXIS IS MORE FREQUENT FOLLOWING PARENTERAL THERAPY, IT HAS OCCURRED IN PATIENTS ON ORAL PENICILLINS. THESE REACTIONS ARE MORE LIKELY TO OCCUR IN INDIVIDUALS WITH A HISTORY OF PENICILLIN HYPERSENSITIVITY AND/OR A HISTORY OF SENSITIVITY TO MULTIPLE ALLERGENS. THERE HAVE BEEN REPORTS OF INDIVIDUALS WITH A HISTORY OF PENICILLIN HYPERSENSITIVITY WHO HAVE EXPERIENCED SEVERE REACTIONS WHEN TREATED WITH CEPHALOSPORINS. BEFORE INITIATING THERAPY WITH Amoxil, CAREFUL INQUIRY SHOULD BE MADE CONCERNING PREVIOUS HYPERSENSITIVITY REACTIONS TO PENICILLINS, CEPHALOSPORINS, OR OTHER ALLERGENS. IF AN ALLERGIC REACTION OCCURS, Amoxil SHOULD BE DISCONTINUED AND APPROPRIATE THERAPY INSTITUTED. SERIOUS ANAPHYLACTIC REACTIONS REQUIRE IMMEDIATE EMERGENCY TREATMENT WITH EPINEPHRINE. OXYGEN, INTRAVENOUS STEROIDS, AND AIRWAY MANAGEMENT, INCLUDING INTUBATION, SHOULD ALSO BE ADMINISTERED AS INDICATED.

Clostridium difficile associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents, including Amoxil, 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.

Precautions

General

The possibility of superinfections with mycotic or bacterial pathogens should be kept in mind during therapy. If superinfections occur, amoxicillin should be discontinued and appropriate therapy instituted.

A high percentage of patients with mononucleosis who receive ampicillin develop an erythematous skin rash. Thus, ampicillin-class antibiotics should not be administered to patients with mononucleosis.

Prescribing Amoxil 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.

Phenylketonurics

Each 200-mg chewable tablet of Amoxil contains 1.82 mg phenylalanine; each 400-mg chewable tablet contains 3.64 mg phenylalanine. The suspensions of Amoxil do not contain phenylalanine and can be used by phenylketonurics.

Laboratory Tests

As with any potent drug, periodic assessment of renal, hepatic, and hematopoietic function should be made during prolonged therapy.

All patients with gonorrhea should have a serologic test for syphilis at the time of diagnosis. Patients treated with amoxicillin should have a follow-up serologic test for syphilis after 3 months.

Drug Interactions

Probenecid decreases the renal tubular secretion of amoxicillin. Concurrent use of amoxicillin and probenecid may result in increased and prolonged blood levels of amoxicillin.

Abnormal prolongation of prothrombin time (increased international normalized ratio [INR]) has been reported rarely in patients receiving amoxicillin and oral anticoagulants. Appropriate monitoring should be undertaken when anticoagulants are prescribed concurrently. Adjustments in the dose of oral anticoagulants may be necessary to maintain the desired level of anticoagulation.

Chloramphenicol, macrolides, sulfonamides, and tetracyclines may interfere with the bactericidal effects of penicillin. This has been demonstrated in vitro; however, the clinical significance of this interaction is not well documented.

In common with other antibiotics, Amoxil may affect the gut flora, leading to lower estrogen reabsorption and reduced efficacy of combined oral estrogen/progesterone contraceptives.

Drug/Laboratory Test Interactions

High urine concentrations of ampicillin may result in false-positive reactions when testing for the presence of glucose in urine using CLINITEST®, Benedict’s Solution, or Fehling’s Solution. Since this effect may also occur with amoxicillin, it is recommended that glucose tests based on enzymatic glucose oxidase reactions (such as CLINISTIX®) be used.

Following administration of ampicillin to pregnant women, a transient decrease in plasma concentration of total conjugated estriol, estriol-glucuronide, conjugated estrone, and estradiol has been noted. This effect may also occur with amoxicillin.

Carcinogenesis, Mutagenesis, Impairment of Fertility

Long-term studies in animals have not been performed to evaluate carcinogenic potential. Studies to detect mutagenic potential of amoxicillin alone have not been conducted; however, the following information is available from tests on a 4:1 mixture of amoxicillin and potassium clavulanate (AUGMENTIN). AUGMENTIN was non-mutagenic in the Ames bacterial mutation assay, and the yeast gene conversion assay. AUGMENTIN was weakly positive in the mouse lymphoma assay, but the trend toward increased mutation frequencies in this assay occurred at doses that were also associated with decreased cell survival. AUGMENTIN was negative in the mouse micronucleus test, and in the dominant lethal assay in mice. Potassium clavulanate alone was tested in the Ames bacterial mutation assay and in the mouse micronucleus test, and was negative in each of these assays. In a multi-generation reproduction study in rats, no impairment of fertility or other adverse reproductive effects were seen at doses up to 500 mg/kg (approximately 3 times the human dose in mg/m2).

Pregnancy

Teratogenic Effects

Pregnancy Category B. Reproduction studies have been performed in mice and rats at doses up to 10 times the human dose and have revealed no evidence of impaired fertility or harm to the fetus due to amoxicillin. There are, however, no adequate and well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed.

Labor and Delivery

Oral ampicillin-class antibiotics are poorly absorbed during labor. Studies in guinea pigs showed that intravenous administration of ampicillin slightly decreased the uterine tone and frequency of contractions but moderately increased the height and duration of contractions. However, it is not known whether use of amoxicillin in humans during labor or delivery has immediate or delayed adverse effects on the fetus, prolongs the duration of labor, or increases the likelihood that forceps delivery or other obstetrical intervention or resuscitation of the newborn will be necessary.

Nursing Mothers

Penicillins have been shown to be excreted in human milk. Amoxicillin use by nursing mothers may lead to sensitization of infants. Caution should be exercised when amoxicillin is administered to a nursing woman.

Pediatric Use

Because of incompletely developed renal function in neonates and young infants, the elimination of amoxicillin may be delayed. Dosing of Amoxil should be modified in pediatric patients 12 weeks or younger (≤ 3 months). (See DOSAGE AND ADMINISTRATION: Neonates and Infants.)

Geriatric Use

An analysis of clinical studies of Amoxil was conducted to determine whether subjects aged 65 and over respond differently from younger subjects. Of the 1,811 subjects treated with capsules of Amoxil, 85% were < 60 years old, 15% were ≥ 61 years old and 7% were ≥ 71 years old. This analysis and other reported clinical experience have not identified differences in responses between the elderly and younger patients, but a greater sensitivity of some older individuals cannot be ruled out.

This drug is known to be substantially excreted by the kidney, and the risk of toxic reactions to this drug may be greater in patients with impaired renal function. Because elderly patients are more likely to have decreased renal function, care should be taken in dose selection, and it may be useful to monitor renal function.

Information for Patients

Amoxil may be taken every 8 hours or every 12 hours, depending on the strength of the product prescribed.

Patients should be counseled that antibacterial drugs, including Amoxil, should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold). When Amoxil is prescribed to treat a bacterial infection, patients should be told that although it is common to feel better early in the course of 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 Amoxil 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 2 or more months after having taken the last dose of the antibiotic. If this occurs, patients should contact their physician as soon as possible.

Adverse Reactions

As with other penicillins, it may be expected that untoward reactions will be essentially limited to sensitivity phenomena. They are more likely to occur in individuals who have previously demonstrated hypersensitivity to penicillins and in those with a history of allergy, asthma, hay fever, or urticaria. The following adverse reactions have been reported as associated with the use of penicillins:

Infections and Infestations

Mucocutaneous candidiasis.

Gastrointestinal

Nausea, vomiting, diarrhea, black hairy tongue, and hemorrhagic/pseudomembranous colitis.

Onset of pseudomembranous colitis symptoms may occur during or after antibiotic treatment. (See WARNINGS.)

Hypersensitivity Reactions

Anaphylaxis (See WARNING)

Serum sickness–like reactions, erythematous maculopapular rashes, erythema multiforme, Stevens-Johnson syndrome, exfoliative dermatitis, toxic epidermal necrolysis, acute generalized exanthematous pustulosis, hypersensitivity vasculitis and urticaria have been reported.

NOTE: These hypersensitivity reactions may be controlled with antihistamines and, if necessary, systemic corticosteroids. Whenever such reactions occur, amoxicillin should be discontinued unless, in the opinion of the physician, the condition being treated is life-threatening and amenable only to amoxicillin therapy.

Liver

A moderate rise in AST (SGOT) and/or ALT (SGPT) has been noted, but the significance of this finding is unknown. Hepatic dysfunction including cholestatic jaundice, hepatic cholestasis and acute cytolytic hepatitis have been reported.

Renal

Crystalluria has also been reported (see OVERDOSAGE).

Hemic and Lymphatic Systems

Anemia, including hemolytic anemia, thrombocytopenia, thrombocytopenic purpura, eosinophilia, leukopenia, and agranulocytosis have been reported during therapy with penicillins. These reactions are usually reversible on discontinuation of therapy and are believed to be hypersensitivity phenomena.

Central Nervous System

Reversible hyperactivity, agitation, anxiety, insomnia, confusion, convulsions, behavioral changes, and/or dizziness have been reported rarely.

Miscellaneous

Tooth discoloration (brown, yellow, or gray staining) has been rarely reported. Most reports occurred in pediatric patients. Discoloration was reduced or eliminated with brushing or dental cleaning in most cases.

Combination Therapy with Clarithromycin and Lansoprazole

In clinical trials using combination therapy with amoxicillin plus clarithromycin and lansoprazole, and amoxicillin plus lansoprazole, no adverse reactions peculiar to these drug combinations were observed. Adverse reactions that have occurred have been limited to those that had been previously reported with amoxicillin, clarithromycin, or lansoprazole.

Triple Therapy

Amoxicillin/Clarithromycin/Lansoprazole

The most frequently reported adverse events for patients who received triple therapy were diarrhea (7%), headache (6%), and taste perversion (5%). No treatment-emergent adverse events were observed at significantly higher rates with triple therapy than with any dual therapy regimen.

Dual Therapy

Amoxicillin/Lansoprazole

The most frequently reported adverse events for patients who received amoxicillin three times daily plus lansoprazole three times daily dual therapy were diarrhea (8%) and headache (7%). No treatment-emergent adverse events were observed at significantly higher rates with amoxicillin three times daily plus lansoprazole three times daily dual therapy than with lansoprazole alone.

For more information on adverse reactions with clarithromycin or lansoprazole, refer to their package inserts, ADVERSE REACTIONS.

Overdosage

In case of overdosage, discontinue medication, treat symptomatically, and institute supportive measures as required. If the overdosage is very recent and there is no contraindication, an attempt at emesis or other means of removal of drug from the stomach may be performed. A prospective study of 51 pediatric patients at a poison-control center suggested that overdosages of less than 250 mg/kg of amoxicillin are not associated with significant clinical symptoms and do not require gastric emptying.3

Interstitial nephritis resulting in oliguric renal failure has been reported in a small number of patients after overdosage with amoxicillin.

Crystalluria, in some cases leading to renal failure, has also been reported after amoxicillin overdosage in adult and pediatric patients. In case of overdosage, adequate fluid intake and diuresis should be maintained to reduce the risk of amoxicillin crystalluria.

Renal impairment appears to be reversible with cessation of drug administration. High blood levels may occur more readily in patients with impaired renal function because of decreased renal clearance of amoxicillin. Amoxicillin may be removed from circulation by hemodialysis.

Amoxil Dosage and Administration

Capsules, chewable tablets, and oral suspensions of Amoxil may be given without regard to meals. The 400-mg suspension, 400-mg chewable tablet, and the 875-mg tablet have been studied only when administered at the start of a light meal. However, food effect studies have not been performed with the 200-mg and 500-mg formulations.

Neonates and Infants Aged ≤ 12 Weeks (≤ 3 Months)

Due to incompletely developed renal function affecting elimination of amoxicillin in this age group, the recommended upper dose of Amoxil is 30 mg/kg/day divided q12h.

Adults and Pediatric Patients > 3 Months:
Infection Severitya Usual Adult Dose Usual Dose for Children > 3 Monthsb
Ear/Nose/Throat Mild/Moderate 500 mg every 12 hours or 250 mg every 8 hours

25 mg/kg/day in divided doses every 12 hours

or

20 mg/kg/day in divided doses every 8 hours
Severe 875 mg every 12 hours or 500 mg every 8 hours

45 mg/kg/day in divided doses every 12 hours

or

40 mg/kg/day in divided doses every 8 hours
Lower Respiratory Tract Mild/Moderate or Severe 875 mg every 12 hours or 500 mg every 8 hours

45 mg/kg/day in divided doses every 12 hours

or

40 mg/kg/day in divided doses every 8 hours
Skin/Skin Structure Mild/Moderate 500 mg every 12 hours or 250 mg every 8 hours

25 mg/kg/day in divided doses every 12 hours

or

20 mg/kg/day in divided doses every 8 hours
Severe 875 mg every 12 hours or 500 mg every 8 hours

45 mg/kg/day in divided doses every 12 hours

or

40 mg/kg/day in divided doses every 8 hours
 
Genitourinary Tract Mild/Moderate 500 mg every 12 hours or 250 mg every 8 hours

25 mg/kg/day in divided doses every 12 hours

or

20 mg/kg/day in divided doses every 8 hours
Severe 875 mg every 12 hours or 500 mg every 8 hours

45 mg/kg/day in divided doses every 12 hours

or

40 mg/kg/day in divided doses every 8 hours
 

Gonorrhea

Acute, uncomplicated ano-genital and urethral infections in males and females
3 grams as single oral dose

Prepubertal children:

50 mg/kg Amoxil, combined with 25 mg/kg probenecid as a single dose.

NOTE: SINCE PROBENECID IS CONTRAINDICATED IN CHILDREN UNDER 2 YEARS, DO NOT USE THIS REGIMEN IN THESE CASES.

a  Dosing for infections caused by less susceptible organisms should follow the recommendations for severe infections.

b  The children’s dosage is intended for individuals whose weight is less than 40 kg. Children weighing 40 kg or more should be dosed according to the adult recommendations.

After reconstitution, the required amount of suspension should be placed directly on the child’s tongue for swallowing. Alternate means of administration are to add the required amount of suspension to formula, milk, fruit juice, water, ginger ale, or cold drinks. These preparations should then be taken immediately. To be certain the child is receiving full dosage, such preparations should be consumed in entirety.

All patients with gonorrhea should be evaluated for syphilis. (See PRECAUTIONS: Laboratory Tests.)

Larger doses may be required for stubborn or severe infections.

General

It should be recognized that in the treatment of chronic urinary tract infections, frequent bacteriological and clinical appraisals are necessary. Smaller doses than those recommended above should not be used. Even higher doses may be needed at times. In stubborn infections, therapy may be required for several weeks. It may be necessary to continue clinical and/or bacteriological follow-up for several months after cessation of therapy. Except for gonorrhea, treatment should be continued for a minimum of 48 to 72 hours beyond the time that the patient becomes asymptomatic or evidence of bacterial eradication has been obtained. It is recommended that there be at least 10 days’ treatment for any infection caused by Streptococcus pyogenes to prevent the occurrence of acute rheumatic fever.

H. pylori Eradication to Reduce the Risk of Duodenal Ulcer Recurrence

Triple Therapy

Amoxil/clarithromycin/lansoprazole

The recommended adult oral dose is 1 gram Amoxil, 500 mg clarithromycin, and 30 mg lansoprazole, all given twice daily (q12h) for 14 days. (See INDICATIONS AND USAGE.)

Dual Therapy

Amoxil/lansoprazole

The recommended adult oral dose is 1 gram Amoxil and 30 mg lansoprazole, each given three times daily (q8h) for 14 days. (See INDICATIONS AND USAGE.)

Please refer to clarithromycin and lansoprazole full prescribing information for CONTRAINDICATIONS and WARNINGS, and for information regarding dosing in elderly and renally impaired patients.

Dosing Recommendations for Adults with Impaired Renal Function

Patients with impaired renal function do not generally require a reduction in dose unless the impairment is severe. Severely impaired patients with a glomerular filtration rate of < 30 mL/min. should not receive the 875-mg tablet. Patients with a glomerular filtration rate of 10 to 30 mL/min. should receive 500 mg or 250 mg every 12 hours, depending on the severity of the infection. Patients with a less than 10 mL/min. glomerular filtration rate should receive 500 mg or 250 mg every 24 hours, depending on severity of the infection.

Hemodialysis patients should receive 500 mg or 250 mg every 24 hours, depending on severity of the infection. They should receive an additional dose both during and at the end of dialysis.

There are currently no dosing recommendations for pediatric patients with impaired renal function.

Directions for Mixing Oral Suspension

Prepare suspension at time of dispensing as follows: Tap bottle until all powder flows freely. Add approximately 1/3 of the total amount of water for reconstitution (see table below) and shake vigorously to wet powder. Add remainder of the water and again shake vigorously.

250 mg/5 mL

Bottle Size

Amount of Water

Required for Reconstitution

100 mL

74 mL

150 mL

111 mL

Each teaspoonful (5 mL) will contain 250 mg amoxicillin.

400 mg/5 mL

Bottle Size

Amount of Water

Required for Reconstitution

100 mL

71 mL

Each teaspoonful (5 mL) will contain 400 mg amoxicillin.

Directions for Mixing Pediatric Drops

Prepare pediatric drops at time of dispensing as follows: Add the required amount of water (see table below) to the bottle and shake vigorously. Each mL of suspension will then contain amoxicillin trihydrate equivalent to 50 mg amoxicillin.

Bottle Size

Amount of Water

Required for Reconstitution

30 mL

23 mL

NOTE: SHAKE BOTH ORAL SUSPENSION AND PEDIATRIC DROPS WELL BEFORE USING. Keep bottle tightly closed. Any unused portion of the reconstituted suspension must be discarded after 14 days. Refrigeration preferable, but not required.

How is Amoxil Supplied

Capsules of Amoxil

Each capsule contains 500 mg amoxicillin as the trihydrate.

500 mg Capsule

NDC 0029-6007-32

Bottles of 500

Amoxil for Oral Suspension

Each 5 mL of reconstituted bubble-gum-flavored suspension contains 250, or 400 mg amoxicillin as the trihydrate.

250 mg/5 mL

NDC 0029-6009-23

100-mL bottle

NDC 0029-6009-22

150-mL bottle

400 mg/5 mL

NDC 0029-6049-59

100-mL bottle

Pediatric Drops of Amoxil for Oral Suspension

Each mL of bubble-gum-flavored reconstituted suspension contains 50 mg amoxicillin as the trihydrate.

NDC 0029-6038-39

30-mL bottle

Store at or below 20°C (68°F)

•500-mg capsules

•250-mg unreconstituted powder

Store at or below 25°C (77°F)

•400-mg unreconstituted powder

Dispense in a tight container.

Clinical Studies

H. pylori Eradication to Reduce the Risk of Duodenal Ulcer Recurrence

Randomized, double-blind clinical studies performed in the United States in patients with H. pylori and duodenal ulcer disease (defined as an active ulcer or history of an ulcer within 1 year) evaluated the efficacy of lansoprazole in combination with amoxicillin capsules and clarithromycin tablets as triple 14-day therapy, or in combination with amoxicillin capsules as dual 14-day therapy, for the eradication of H. pylori. Based on the results of these studies, the safety and efficacy of 2 different eradication regimens were established:

Triple Therapy

Amoxicillin 1 gram twice daily/clarithromycin 500 mg twice daily/lansoprazole 30 mg twice daily.

Dual Therapy

Amoxicillin 1 gram three times daily/lansoprazole 30 mg three times daily.

All treatments were for 14 days. H. pylori eradication was defined as 2 negative tests (culture and histology) at 4 to 6 weeks following the end of treatment.

Triple therapy was shown to be more effective than all possible dual therapy combinations. Dual therapy was shown to be more effective than both monotherapies. Eradication of H. pylori has been shown to reduce the risk of duodenal ulcer recurrence.

H. pylori Eradication Rates – Triple Therapy (amoxicillin/clarithromycin/lansoprazole) Percent of Patients Cured  [95% Confidence Interval]  (Number of Patients)
Study Triple Therapy Triple Therapy
Evaluable Analysisa Intent-to-Treat Analysisb  
Study 1

92c

[80.0 - 97.7]

(n = 48)

86c

[73.3 - 93.5]

(n = 55)
Study 2

86d

[75.7 - 93.6]

(n = 66)

83d

[72.0 - 90.8]

(n = 70)

a  This analysis was based on evaluable patients with confirmed duodenal ulcer (active or within 1 year) and H. pylori infection at baseline defined as at least 2 of 3 positive endoscopic tests from CLOtest®, (Delta West Ltd., Bentley, Australia), histology, and/or culture. Patients were included in the analysis if they completed the study. Additionally, if patients dropped out of the study due to an adverse event related to the study drug, they were included in the analysis as failures of therapy.

b  Patients were included in the analysis if they had documented H. pylori infection at baseline as defined above and had a confirmed duodenal ulcer (active or within 1 year). All dropouts were included as failures of therapy.

c  (P < 0.05) versus lansoprazole/amoxicillin and lansoprazole/clarithromycin dual therapy.

d  (P < 0.05) versus clarithromycin/amoxicillin dual therapy.

H. pylori Eradication Rates – Dual Therapy (amoxicillin/lansoprazole) Percent of Patients Cured [95% Confidence Interval] (Number of Patients)
Study Dual Therapy Dual Therapy
Evaluable Analysisa Intent-to-Treat Analysisb  
Study 1

77c

[62.5 - 87.2]

(n = 51)

70c

[56.8 - 81.2]

(n = 60)
Study 2

66d

[51.9 - 77.5]

(n = 58)

61d

[48.5 - 72.9]

(n = 67)

a  This analysis was based on evaluable patients with confirmed duodenal ulcer (active or within 1 year) and H. pylori infection at baseline defined as at least 2 of 3 positive endoscopic tests from CLOtest®, histology, and/or culture. Patients were included in the analysis if they completed the study. Additionally, if patients dropped out of the study due to an adverse event related to the study drug, they were included in the analysis as failures of therapy.

b  Patients were included in the analysis if they had documented H. pylori infection at baseline as defined above and had a confirmed duodenal ulcer (active or within 1 year). All dropouts were included as failures of therapy.

c  (P < 0.05) versus lansoprazole alone.

d  (P < 0.05) versus lansoprazole alone or amoxicillin alone.

REFERENCES

  1. National Committee for Clinical Laboratory Standards. Methods for Dilution Antimicrobial Susceptibility Tests for Bacteria that Grow Aerobically – Fourth Edition; Approved Standard NCCLS Document M7-A4, Vol. 17, No. 2. NCCLS, Wayne, PA, January 1997.
  2. National Committee for Clinical Laboratory Standards. Performance Standards for Antimicrobial Disk Susceptibility Tests – Sixth Edition; Approved Standard NCCLS Document M2-A6, Vol. 17, No. 1. NCCLS, Wayne, PA, January 1997.
  3. Swanson-Biearman B, Dean BS, Lopez G, Krenzelok EP. The effects of penicillin and cephalosporin ingestions in children less than six years of age. Vet Hum Toxicol. 1988;30:66-67.

Amoxil and AUGMENTIN are registered trademarks of GlaxoSmithKline. The following are registered trademarks of their respective owners: CLINITEST and CLINISTIX/Bayer Corporation; CLOtest/Kimberly-Clark Corporation.

GlaxoSmithKline

Research Triangle Park, NC 27709

©2009, GlaxoSmithKline. All rights reserved.

September 2009                    AMX:33PI

Principal Display Panel

NDC 0029-6007-32

Amoxil®

AMOXICILLIN CAPSULES

Rx only

500 Capsules

500 mg

Store at room temperature.

Dispense in a tight container.

Each capsule contains 500 mg amoxicillin as the trihydrate.

Usual Adult Dosage: 250 to 500 mg every 8 hours.

See accompanying prescribing information.

Important: Use safety closures when dispensing this product unless otherwise directed by physician or requested by purchaser.

GlaxoSmithKline

Research Triangle Park, NC 27709

10000000028387


Principal Display Panel

NDC 0029-6009-23

Amoxil®

AMOXICILLIN

FOR ORAL SUSPENSION

250 mg/5 mL

Rx only

100 mL (when reconstituted)

Net contents: Equivalent to 5.0 grams amoxicillin.

Store dry powder at room temperature.

Directions for mixing: Tap bottle until all powder flows freely. Add approximately 1/3 total amount of water for reconstitution (total=74 mL); shake vigorously to wet powder. Add remaining water; again shake vigorously. Each 5 mL (1 teaspoonful) will contain amoxicillin trihydrate equivalent to 250 mg amoxicillin.

Usual Adult Dosage: 250 to 500 mg every 8 hours.

Usual Child Dosage: 20 to 40 mg/kg/day in divided doses every 8 hours, depending on age, weight and infection severity. See accompanying prescribing information.

Keep tightly closed. Shake well before using. Refrigeration preferable but not required. Discard suspension after 14 days.

GlaxoSmithKline

Research Triangle Park, NC 27709

Rev. 7/04

9420002-A


Principal Display Panel

NDC 0029-6038-39

Amoxil®

AMOXICILLIN PEDIATRIC DROPS

FOR ORAL SUSPENSION

Rx only

50 mg/mL

30 mL (when reconstituted)

Store dry powder at room temperature.

This bottle contains amoxicillin trihydrate equivalent to 1.5 grams amoxicillin.

Directions for Mixing:

Add 23 mL of water and shake vigorously. Each mL will then contain amoxicillin trihydrate equivalent to 50 mg amoxicillin.

Discard unused portion of the reconstituted suspension after 14 days. Refrigeration preferable, but not required.

KEEP BOTTLE TIGHTLY CLOSED. SHAKE WELL BEFORE USING.

Usual Dosage: 20 to 40 mg/kg/day in divided doses every 8 hours depending on age, weight and infection severity. See accompanying prescribing information. CALIBRATED DROPPER ENCLOSED.

GlaxoSmithKline

Research Triangle Park, NC 27709

Principal Display Panel

NDC 0029-6049-59

Product Discontinued 3/26/2010

Amoxil 
amoxicillin powder, for suspension
Product Information
Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC:0029-6009
Route of Administration ORAL DEA Schedule     
Active Ingredient/Active Moiety
Ingredient Name Basis of Strength Strength
AMOXICILLIN (AMOXICILLIN) AMOXICILLIN 250 mg  in 5 mL
Inactive Ingredients
Ingredient Name Strength
FD&C RED NO. 3  
SILICON DIOXIDE  
SODIUM BENZOATE  
SODIUM CITRATE  
SUCROSE  
XANTHAN GUM  
Product Characteristics
Color PINK Score     
Shape Size
Flavor BUBBLE GUM Imprint Code
Contains         
Packaging
# Item Code Package Description
1 NDC:0029-6009-22 150 mL in 1 BOTTLE
2 NDC:0029-6009-23 100 mL in 1 BOTTLE
Marketing Information
Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date
ANDA ANDA062226 10/22/1990
Amoxil 
amoxicillin capsule
Product Information
Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC:0029-6007
Route of Administration ORAL DEA Schedule     
Active Ingredient/Active Moiety
Ingredient Name Basis of Strength Strength
AMOXICILLIN (AMOXICILLIN) AMOXICILLIN 500 mg
Inactive Ingredients
Ingredient Name Strength
D&C RED NO. 28  
FD&C BLUE NO. 1  
FD&C RED NO. 40  
GELATIN  
MAGNESIUM STEARATE  
TITANIUM DIOXIDE  
Product Characteristics
Color BLUE (royal blue opaque cap) , PINK (opaque body) Score no score
Shape CAPSULE Size 20mm
Flavor Imprint Code Amoxil;500
Contains         
Packaging
# Item Code Package Description
1 NDC:0029-6007-32 500 CAPSULE (CAPSULE) in 1 BOTTLE
Marketing Information
Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date
ANDA ANDA062216 10/22/1990
Amoxil 
amoxicillin powder, for suspension
Product Information
Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC:0029-6049
Route of Administration ORAL DEA Schedule     
Active Ingredient/Active Moiety
Ingredient Name Basis of Strength Strength
AMOXICILLIN (AMOXICILLIN) AMOXICILLIN 400 mg  in 5 mL
Inactive Ingredients
Ingredient Name Strength
FD&C RED NO. 3  
SILICON DIOXIDE  
SODIUM BENZOATE  
SODIUM CITRATE  
SUCROSE  
XANTHAN GUM  
Product Characteristics
Color PINK Score     
Shape Size
Flavor BUBBLE GUM Imprint Code
Contains         
Packaging
# Item Code Package Description
1 NDC:0029-6049-59 100 mL in 1 BOTTLE
Marketing Information
Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date
NDA NDA050760 10/22/1990 03/26/2010
Amoxil 
amoxicillin powder, for suspension
Product Information
Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC:0029-6038
Route of Administration ORAL DEA Schedule     
Active Ingredient/Active Moiety
Ingredient Name Basis of Strength Strength
AMOXICILLIN (AMOXICILLIN) AMOXICILLIN 50 mg  in 1 mL
Inactive Ingredients
Ingredient Name Strength
FD&C RED NO. 3  
SILICON DIOXIDE  
SODIUM BENZOATE  
SODIUM CITRATE  
SUCROSE  
XANTHAN GUM  
Product Characteristics
Color PINK Score     
Shape Size
Flavor BUBBLE GUM Imprint Code
Contains         
Packaging
# Item Code Package Description
1 NDC:0029-6038-39 30 mL in 1 BOTTLE
Marketing Information
Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date
ANDA ANDA062226 10/22/1990
Labeler - GlaxoSmithKline LLC (167380711)
Revised: 04/2010
 
GlaxoSmithKline LLC
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