FDA pharmacologic class
Rifamycin Antibacterial
2 medicines are in FDA's class of rifamycin antibacterials: rifampin and rifaximin (Xifaxan). 1 of the 2 are listed from generic labelers (FDA NDC Directory, October 8, 2026). The lowest pharmacy cost is rifampin 300 mg capsule at $0.679 per capsule (NADAC).
Which medicines are rifamycin antibacterial?
Source: FDA Established Pharmacologic Class (NDC Directory, openFDA); CMS NADAC of October 7, 2026; FDA shortages and recalls (FDA files October 8, 2026)
What do pharmacies pay?
Each medicine's most widely listed form, per unit, in the NADAC survey: what pharmacies paid, not what a patient pays; strengths differ, so compare like with like.
Source: CMS National Average Drug Acquisition Cost (NADAC) survey, October 7, 2026: what retail pharmacies paid per unit; not a counter price