Zithromax Side Effects
Generic Name: azithromycin
Note: This page contains side effects data for the generic drug azithromycin. It is possible that some of the dosage forms included below may not apply to the brand name Zithromax.
It is possible that some side effects of Zithromax may not have been reported. These can be reported to the FDA here. Always consult a healthcare professional for medical advice.
For the Consumer
Applies to azithromycin: oral capsule, oral powder for suspension, oral powder for suspension extended release, oral tablet
Other dosage forms:
As well as its needed effects, azithromycin (the active ingredient contained in Zithromax) may cause unwanted side effects that require medical attention.
If any of the following side effects occur while taking azithromycin, check with your doctor immediately:More common
- loose stools
- Blistering, crusting, irritation, itching, or reddening of the skin
- cracked, dry, or scaly skin
- Abdominal or stomach pain
- blistering, peeling, or loosening of the skin
- bloody or cloudy urine
- bloody, black, or tarry stools
- body aches or pain
- burning while urinating
- chest pain
- cough increased
- cough producing mucus
- dark urine
- difficult or labored breathing
- difficult or painful urination
- dryness or soreness of the throat
- fast, irregular, pounding, or racing heartbeat or pulse
- general feeling of discomfort or illness
- general feeling of tiredness or weakness
- irregular or slow heart rate
- joint or muscle pain
- large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
- light-colored stools
- loss of appetite
- muscle aches and pains
- nausea or vomiting
- noisy breathing
- passing of gas
- red skin lesions, often with a purple center
- red, irritated eyes
- redness or swelling in the ear
- runny nose
- shortness of breath
- sores, ulcers, or white spots on the lips or in the mouth
- stomach pain, continuing
- stomach pain, fullness, or discomfort
- stuffy nose
- swelling of the face, ankles, hands, feet, or lower legs
- tender, swollen glands in the neck
- tightness in the chest
- trouble with sleeping
- trouble with swallowing
- unpleasant breath odor
- unusual bleeding or bruising
- unusual tiredness or weakness
- upper right abdominal or stomach pain
- voice changes
- vomiting of blood
- yellow eyes or skin
- Abdominal or stomach cramps or tenderness
- bleeding gums
- blood in the urine or stools
- blurred vision
- change in hearing
- clay-colored stools
- continuing ringing or buzzing or other unexplained noise in the ears
- decreased urine output
- diarrhea, watery and severe, which may also be bloody
- dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
- greatly decreased frequency of urination or amount of urine
- increased thirst
- loss of hearing
- lower back or side pain
- muscle twitching
- pains in the stomach, side, or abdomen, possibly radiating to the back
- pale skin
- pinpoint red spots on the skin
- puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
- rapid weight gain
- unusual weight loss
Some azithromycin side effects may not need any medical attention. As your body gets used to the medicine these side effects may disappear. Your health care professional may be able to help you prevent or reduce these side effects, but do check with them if any of the following side effects continue, or if you are concerned about them:Rare
- Acid or sour stomach
- aggressive or angry
- bad, unusual, or unpleasant (after) taste
- burning feeling in the chest or stomach
- burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
- change in taste
- changes in the color of the tongue
- dry mouth
- excess air or gas in the stomach or intestines
- feeling of constant movement of self or surroundings
- full feeling
- increase in body movements
- itching of the vagina or genital area
- lack or loss of strength
- mental depression
- pain during sexual intercourse
- quick to react or overreact emotionally
- rapidly changing moods
- rash with flat lesions or small raised lesions on the skin
- redness of the skin
- sensation of spinning
- shortness of breath
- sleepiness or unusual drowsiness
- sore mouth or tongue
- stomach upset
- thick, white vaginal discharge with no odor or with a mild odor
- unable to sleep
- white patches in the mouth, tongue, or throat
- Difficulty with moving
- fear or nervousness
- increased sensitivity of the skin to sunlight
- muscle pain or stiffness
- pain in the joints
- redness or other discoloration of the skin
- severe sunburn
- trouble sitting still
For Healthcare Professionals
Applies to azithromycin: intravenous powder for injection, oral capsule, oral powder for reconstitution, oral powder for reconstitution extended release, oral tablet
Gastrointestinal side effects have included nausea, abdominal discomfort, vomiting, and diarrhea in up to 10% of patients. However, patients rarely (less than 1%) discontinued therapy due to these side effects. Dyspepsia, flatulence, mucositis, oral moniliasis, constipation, melena, and gastritis have been reported with a frequency of 1% or less. Pseudomembranous colitis has been reported with nearly all antibacterial agents and may range in severity from mild to life-threatening. Therefore, it is important to consider this diagnosis in patients who present with diarrhea subsequent to the administration of azithromycin (the active ingredient contained in Zithromax) Anorexia, vomiting/diarrhea rarely resulting in dehydration, pancreatitis, oral candidiasis, pyloric stenosis, and rare cases of tongue discoloration have been reported during postmarketing experience.
Reappearance of allergic symptoms may occur without further azithromycin (the active ingredient contained in Zithromax) exposure when symptomatic therapy is discontinued. This phenomenon may be related to the long tissue half-life of the drug. Patients experiencing allergic symptoms may require prolonged periods of observation and symptomatic treatment.
Hypersensitivity side effects have rarely included angioedema, anaphylaxis, Stevens-Johnson syndrome, and toxic epidermal necrolysis. Toxic pustuloderma with fever has been reported in at least one patient receiving azithromycin. There is also an isolated report of azithromycin-induced hypersensitivity syndrome. Allergic reactions (including arthralgia, edema, urticaria, and angioedema) and anaphylaxis (rarely fatal) have been reported during postmarketing experience.
Cardiovascular side effects have rarely included arrhythmias (including ventricular tachycardia), prolongation of the QT interval, torsades de pointes, palpitations, hypotension, and chest pain in postmarketing experience. A causal relationship has not been established.
Hepatic side effects have infrequently included transient elevations of liver function tests (including AST and ALT) and elevated bilirubin. Hepatitis and cholestatic jaundice, as well as rare cases of hepatic necrosis and hepatic failure (some resulting in death), have been reported during postmarketing experience.
Local side effects associated with intravenous administration of the drug have included pain at injection site (6.5%) and local inflammation (3.1%).
Nervous system side effects have included headache, somnolence, vertigo, and dizziness in approximately 1% of patients. Hearing disturbances including hearing loss, deafness, and/or tinnitus have been reported rarely. Paresthesia, convulsions, hyperactivity, nervousness, agitation, and syncope have been reported during postmarketing experience.
Dermatologic side effects have included rash, pruritus, and urticaria. Photosensitivity and, rarely, serious skin reactions (including erythema multiforme, Stevens-Johnson syndrome, and toxic epidermal necrolysis) have been reported during postmarketing experience.
Other side effects have included asthenia. Taste/smell perversion and/or loss (rare), fatigue, and malaise have been reported during postmarketing experience.
Renal side effects have rarely included elevations in serum creatinine and blood urea nitrogen. Interstitial nephritis and acute renal failure have been reported during postmarketing experience. Interstitial nephritis resulting in permanent renal failure has been reported in a patient receiving azithromycin (the active ingredient contained in Zithromax) monotherapy.
Hematologic side effects have included decreased lymphocytes, increased eosinophils, leukopenia, and neutropenia. Thrombocytopenia has been reported during postmarketing experience.
Metabolic side effects have included reduced bicarbonate and alterations in potassium.
Psychiatric side effects have included aggressive reaction and anxiety during postmarketing experience.
Genitourinary side effects have included vaginitis. Moniliasis has been reported during postmarketing experience.
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