rifabutin

noun
rif·​a·​bu·​tin | \ ˈrif-ə-ˌbyüt-ᵊn How to pronounce rifabutin (audio) \

Medical Definition of rifabutin

: a semisynthetic antibacterial drug C46H62N4O11 used especially to prevent infection with bacteria of the Mycobacterium avium complex in individuals infected with HIV