DrugDigest: Rifabutin ( Mycobutin ): Information on dosage, usage, side effects, interactions, and drug comparisons, including generics when available.MEDLINEplus: Rifabutin: Features information about dosage, usage, and side effects.Mycobutin: Full prescribing information from RxList.Rifabutin: a.k.a. Mycobutin.