Breakpoints #104 – Dosing Consult: Rifampin Part 1
Oct 4, 2024
In this discussion, experts Chuck Peloquin, a TB treatment guideline contributor from the University of Florida, and Gerry Davies, an infection pharmacology professor at the University of Liverpool, delve into the complexities of rifampin dosing. They debate whether higher doses improve outcomes and explore toxicity thresholds. The duo also discusses alternative rifamycins and management strategies for patients with complications. Tune in for insights on optimizing treatment through therapeutic drug monitoring, especially for those with concurrent infections.
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Start Rifampin at 1200 mg
- Start rifampin dosing at 1,200 mg to avoid low exposures that delay bacterial clearance.
- Avoid beginning treatment with very high doses like 1,800 mg especially in older patients who may tolerate it less well.
Personalize Rifampin Dose Increase
- Increase rifampin dose in severe TB such as TB meningitis or when absorption issues occur.
- For difficult cases like NTM infections, cautiously escalate dose up to 30 mg/kg monitoring for tolerability.
Rifampin Toxicity Profile
- Rifampin hepatotoxicity is dose-dependent but mostly gastrointestinal side effects increase with higher doses.
- Pyrazinamide is the most hepatotoxic TB drug, followed by isoniazid, then rifampin; ethambutol is least toxic.