Please consult your physician before taking any medication. Generic Name: clarithromycin (kla RITH roe MYE sin) Biaxin (clarithromycin) is a macrolide antibiotic. Clarithromycin fights bacteria in your body. Biaxin is used to treat many different types of bacterial infections affecting the skin and respiratory system. It is also used together with other medicines to treat stomach ulcers caused by Helicobacter pylori. Biaxin may also be used for purposes not listed in this medication guide.