clarithromycin

noun

cla·​rith·​ro·​my·​cin klə-ˌrith-rə-ˈmīs-ᵊn 

: a semisynthetic macrolide antibiotic C₃₈H₆₉NO₁₃ used especially in the treatment of various mild to moderate bacterial infections

Macrolides are recommended as first-line therapy for adults in the United States and Canada with community-acquired pneumonia. Newer macrolides (eg, azithromycin, clarithromycin) are popular because of convenient dosing schedules and fewer adverse effects.

—Terri B. Hyde et al., The Journal of the American Medical Association

Note: Clarithromycin is marketed under the trademark Biaxin.