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. Zithromax or Z-PAK (azithromycin) is a semi-synthetic macrolide antibiotic used for treating bacterial infection. Learn about dosages, side effects, drug interaction, warnings, and more. Zithromax is an antibiotic that fights bacteria. Zithromax is used to treat many different types of infections caused by bacteria, such as respiratory infections, skin infections, ear infections, and sexually transmitted diseases. Learn about azithromycin (Zithromax) usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. Also find the prescribing information, announcements, resources, and channels to connect with Pfizer Medical. It works by killing bacteria or preventing their growth. However, this medicine will not work for colds, flu, or other virus infections. This medicine is available only with your doctor's prescription. This product is available in the following dosage forms: 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. Medscape - Infection-specific dosing for Zithromax (azithromycin), frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation schedules, and cost. Azithromycin (Zithromax) is an antibiotic medication that treats bacterial infections. It doesn’t treat viral infections. To reduce the development of drug-resistant bacteria and maintain the effectiveness of ZITHROMAX® (azithromycin) and other antibacterial drugs, ZITHROMAX (azithromycin) should be used only to.