Azithromycin is an antibiotic that fights bacteria. Azithromycin is used to treat many different types of infections caused by bacteria, such as respiratory infections, skin infections, ear infections, eye infections, and sexually transmitted diseases. Azithromycin is in a class of medications called macrolide antibiotics. It works by stopping the growth of bacteria. Antibiotics such as azithromycin will not work for colds, flu, or other viral infections. Using antibiotics when they are not needed increases your risk of getting an infection later that resists antibiotic treatment. 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 ZITHROMAX (azithromycin) is a macrolide antibacterial drug indicated for the treatment of patients with mild to moderate infections caused by susceptible strains of the designated microorganisms. When it works fast, when to watch for side effects, why you shouldn’t skip the last pill, and what no one mentions about your gut afterward. Written plainly, by someone who’s been there. Azithromycin, sold under the brand names Zithromax (in oral form) and Azasite (as an eye drop), is an antibiotic medication used to treat several bacterial infections. [9] Includes Azithromycin (Systemic) indications, dosage/administration, pharmacology, mechanism/onset/duration of action, half-life, dosage forms, interactions, warnings, adverse reactions, off-label uses and more. 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. Overview: Azithromycin is an antibiotic that is used to treat certain bacterial infections. It works by stopping certain types of bacteria from making proteins they need to grow and multiply. Azithromycin may cause diarrhea, and in some cases it can be severe. It may occur 2 months or more after you stop using this medicine. Do not take any medicine to treat diarrhea without first checking with your doctor. Diarrhea medicines may make the diarrhea worse or make it last longer.