Azithromycin is an antibacterial drug used to treat various infections such as COPD exacerbations, pneumonia, skin, urinary, and eye infections. It can interact with other medications, necessitating consultation with a doctor before use, and has potential side effects including nausea, diarrhea, and serious risks like liver issues and irregular heart rhythms. It is available in various oral forms and should not be given to children under 6 months.