Azithromycin oral tablet (Zithromax) is a prescription drug that's used to treat infections caused by bacteria. Learn about uses, dosage, and more. 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 Tablets, 500 mg are supplied as pink, oval shaped film-coated tablets, engraved with "LU" on one side and "L05" on the other side containing azithromycin dihydrate equivalent to 500 mg of azithromycin USP. Azithromycin 500 is an oral antibiotic and is used to treat various bacterial infections related to specific diseases. It is commonly prescribed for treating respiratory tract infections, skin infections and sexually transmitted diseases.