| Zithromax is well tolerated with a low incidence of side effects. The section below lists the adverse reactions identified through clinical trial experience and postmarketing surveillance by system organ class and frequency. Adverse reactions identified from post-marketing experience are included in italics. The frequency grouping is defined using the following convention: Very common ( 1/10); Common ( 1/100 to <1/10); Uncommon ( 1/1,000 to <1/100); Rare ( 1/10,000 to <1/1,000); Very Rare (< 1/10,000); and Not known (cannot be estimated from the available data). Within each frequency grouping, undesirable effects are presented in order of decreasing seriousness.Adverse reactions possibly or probably related to azithromycin based on clinical trial experience and post-marketing surveillance: Infections and Infestations Uncommon ( 1/1,000 to <1/100)Candidiasis, oral candidiasis, vaginal infectionNot known (cannot be estimated from available data)Pseudomembranous colitis (See Section 4.4)Blood and Lymphatic System Disorders Uncommon ( 1/1,000 to < 1/100) Leukopenia, neutropeniaNot known (cannot be estimated from available data)Thrombocytopenia, haemolytic anaemia Immune System Disorders Uncommon ( 1/1,000 to <1/100)Angioedema, hypersensitivityNot known (cannot be estimated from available data)Anaphylactic reaction (See Section 4.4)Metabolism and Nutrition Disorders Common (> 1/100 < 1/10) AnorexiaPsychiatric Disorders Uncommon ( 1/1,000 to <1/100)NervousnessRare (> 1/10,000 < 1/1,000)AgitationNot known (cannot be estimated from available data)Aggression, anxiety Nervous System Disorders Common (> 1/100 < 1/10) Dizziness, headache, paraesthesia, dysgeusiaUncommon ( 1/1,000 to <1/100)Hypoaesethesia, somnolence, insomniaNot known (cannot be estimated from available data)Syncope, convulsion, psychomotor hyperactivity, anosmia, ageusia, parosmia, Myasthenia gravis (See Section 4.4).Eye Disorders Common (> 1/100 < 1/10) Visual impairmentEar and Labyrinth Disorders Common (> 1/100 < 1/10) DeafnessUncommon ( 1/1,000 to <1/100)Hearing impaired, tinnitusRare (> 1/10,000 < 1/1,000) VertigoCardiac Disorders Uncommon ( 1/1,000 to <1/100)PalpitationsNot known (cannot be estimated from available data)Torsades de pointes (See Section 4.4), arrhythmia (See Section 4.4) including ventricular tachycardiaVascular Disorders Not known (cannot be estimated from available data)Hypotension Gastrointestinal Disorders Very common ( 1/10)Diarrhoea, abdominal pain, nausea, flatulenceCommon (> 1/100 < 1/10) Vomiting, dyspepsia Uncommon (> 1/1,000 < 1/100) Gastritis, constipationNot known (cannot be estimated from available data)Pancreatitis, tongue discolouration Hepatobiliary Disorders Uncommon (> 1/1,000 < 1/100)HepatitisRare (> 1/10,000 < 1/1,000) Hepatic function abnormalNot known (cannot be estimated from available data)Hepatic failure (See Section 4.4), which has rarely resulted in death, hepatitis fulminant, hepatic necrosis, jaundice cholestatic Skin and Subcutaneous Tissue Disorders Common (> 1/100 < 1/10) Pruritus and rash Uncommon (> 1/1,000 < 1/100)Stevens-Johnson syndrome, photosensitivity reaction, urticariaNot known (cannot be estimated from available data)Toxic epidermal necrolysis, erythema multiforme Musculoskeletal, Connective Tissue Disorders Common (> 1/100 < 1/10) Arthralgia Renal and Urinary Disorders Not known (cannot be estimated from available data)Renal failure acute, nephritis interstitial General disorders and Administration Site Conditions Common (> 1/100 < 1/10) FatigueUncommon (> 1/1,000 < 1/100)Chest pain, oedema, malaise, astheniaInvestigations Common (> 1/100 < 1/10) Lymphocyte count decreased, eosinophil count increased, blood bicarbonate decreasedUncommon (> 1/1,000 < 1/100)Aspartate aminotransferase increased, alanine aminotransferase increased, blood bilirubin increased, blood urea increased, blood creatinine increased, blood potassium abnormalNot known (cannot be estimated from available data)Electrocardiogram QT prolonged (See Section 4.4) | |