Azithromycin, a macrolide type antibiotic, is helpful in treating susceptible bacterium that causes otitis media (infection of the middle ear), tonsillitis, laryngitis, bronchitis, pneumonia, and sinusitis. It also is used to treat sexually transmitted infectious diseases such as nongonococcal urethritis and cervicitis. The development of the bacteria is halted when the drug is used as ordered by the doctor. Viral infections are not treated with Azithromycin, so the common cold or flu cannot be helped with this drug. The drug is made by in three forms – oral tablet, oral liquid and an intravenous solution. The first dose may be doubled, following the order from the doctor, and then the regular schedule for dosing will follow. Azithromycin standards are quite strict and suppliers are should be verified to make sure you are getting the best quality.