Azithromycin is legally available only with a doctor's prescription, according to Drugs.com. This is to prevent the misuse or overuse of antibiotics, which contribute to antibiotic resistance and decreased drug effectiveness, says Mayo Clinic.
Azithromycin is an antibiotic that is most commonly used to treat certain respiratory infections or sexually transmitted diseases, according to MedLine Plus. It is important to take azithromycin exactly as directed by a doctor. Only a doctor or pharmacist can determine whether certain symptoms merit treatment with antibiotics, and whether there is likely to be side effects, medical risks, or negative interactions with other drugs, according to WebMD.