Azithromycin comes as a tablet, an extended-release (long-acting) suspension (liquid), and a suspension (liquid) to take by mouth. The tablets and suspension (Zithromax) are usually taken with or without food once a day for 1-5 days. Azithromycin is used to treat a variety of bacterial infections including ARDS, sinusitis, pneumonia, and acute bronchitis. Learn about side effects, drug interactions, dosages, warnings, and more. Azithro 500 MG Tablet is an antibiotic used to treat bacterial infections of the nose, throat, tonsils, ears, lungs, skin, etc. It works by blocking the formation of proteins required for bacterial growth. Thus it prevents further bacterial growth and multiplication. Azithro 500 MG Tablet may cause side effects such as stomach pain, diarrhoea, nausea, headache, etc. Consult your doctor if these symptoms persist or become severe. Seek immediate medical attention if you experience symptoms ... Learn about the dosages of azithromycin , a generic antibiotic used to treat various bacterial infections. Find out the typical dosage for adults and children, the form and strengths of the tablet, and how to take it safely.