Find patient medical information for Azithromycin (Zithromax, Z-Pak, Zmax) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Complete guide to azithromycin dosing calculator for pediatric and adult patients. Professional tool for accurate antibiotic dose calculations with safety features. Azithromycin (Z-Pak) treats pneumonia, chlamydia & strep. Get the full dosage schedule, side effects, heart risk warning & 2026 resistance data. Read on for Z-Pak dosage information, including typical dosage, adjustments for health conditions, and what to do if you miss a dose. Azithromycin belongs to a group of drugs called macrolide antibiotics. This article describes the dosages of azithromycin, as well as its strengths and how to take it. Detailed Azithromycin dosage information for adults and children. Includes dosages for Bacterial Infection, Sinusitis, Bronchitis and more; plus renal, liver and dialysis adjustments. Medscape - Infection-specific dosing for Zithromax (azithromycin), frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation schedules, and cost. Azithromycin and amoxicillin are two commonly prescribed antibiotics, each effective against a range of bacterial infections. The choice between them depends on the type of infection, a patient's allergy profile, and practical considerations like dosing convenience. Azithromycin dosing varies significantly by indication, with the most common adult regimen being 500 mg on day 1 followed by 250 mg daily on days 2-5 for respiratory infections, while sexually transmitted infections typically require a single 1-gram dose. 1 The dose is usually 10 to 30 milligrams (mg) per kilogram (kg) of body weight once a day, taken as a single dose. Depending on the type of infection, this may be followed with doses of 5 to 10 mg per kg of body weight once a day for several days.