Rifampin Uses: Treating Tuberculosis, Leprosy, and Other Infections

Rifampin (rifampicin) is a broad-spectrum antibiotic that inhibits bacterial RNA polymerase. It is a cornerstone of combination therapy for several serious infections:

1. Tuberculosis (TB)

Rifampin is a first-line agent for active TB (usually combined with isoniazid, pyrazinamide, and ethambutol) and for latent TB infection (with isoniazid). It penetrates tissues well, including the blood-brain barrier.

2. Leprosy (Hansen's Disease)

Used in multi-drug regimens (with dapsone and clofazimine) for both paucibacillary and multibacillary leprosy. Rifampin is highly bactericidal against Mycobacterium leprae.

3. Meningitis

Effective against Neisseria meningitidis and Streptococcus pneumoniae. Used as prophylaxis for close contacts of meningococcal meningitis cases and as part of treatment regimens.

4. Endocarditis

Added to regimens for prosthetic valve endocarditis caused by Staphylococcus aureus or Enterococcus faecalis to eradicate biofilm-embedded bacteria.

5. Osteomyelitis

Used in combination therapy for bone infections caused by staphylococci or Pseudomonas aeruginosa, often after surgical debridement.

6. Legionnaires' Disease

An alternative agent for severe Legionella pneumophila pneumonia, typically combined with a macrolide or fluoroquinolone.

Important Considerations

• Always used in combination to prevent rapid resistance emergence.
• Drug interactions: Potent inducer of CYP450 enzymes—reduces levels of many drugs (e.g., warfarin, oral contraceptives, antiretrovirals).
• Monitoring: Baseline and periodic liver function tests; watch for hepatotoxicity.
• Side effects: Orange discoloration of body fluids (harmless), flu-like syndrome, thrombocytopenia.

Rifampin requires a prescription and careful medical supervision. Never use it as monotherapy.