Medscape - Infection-specific dosing for Zithromax (azithromycin), frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation schedules, and cost information. NHS medicines information on azithromycin – what it's used for, side effects, dosage and who can take it. No fluff, no fear-mongering — just clear, calm guidance on taking Zithromax. 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. Description Azithromycin is used to treat certain bacterial infections in many different parts of the body. This medicine may mask or delay the symptoms of syphilis. It is not effective against syphilis infections. Azithromycin belongs to the class of drugs known as macrolide antibiotics. It works by killing bacteria or preventing their growth. However, this medicine will not work for colds. Azithromycin Uses Azithromycin is used in the treatment of bacterial infections. It is used in bacterial infections of tonsils, sinus, ear, nose, throat, skin and soft tissues and lungs (pneumonia). Azithromycin has beneficial effects in the treatment of asthma. It possesses antibacterial, antiviral, and anti-inflammatory properties which contribute to its effectiveness. Asthma exacerbations can be caused by chronic neutrophilic inflammation, and azithromycin is known to reduce this type of inflammation due to its immunomodulatory properties. Azithromycin comes as a tablet and a suspension (liquid) to take by mouth. Take azithromycin with or without food once a day. Your doctor will tell you how long you should take azithromycin. When used for the prevention of disseminated MAC infection, azithromycin tablets are taken with or without food once weekly. Take it around the same time every day. Take azithromycin exactly as directed. 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 Azithromycin is an antibiotic used to treat many different types of infections caused by bacteria. Includes Azithromycin side effects, interactions and indications. Azithromycin (Zithromax) is an antibiotic medication that treats bacterial infections. It doesn’t treat viral infections.