MajorClass III antiarrhythmics (Vaughan Williams)×Antituberculous antibiotic
Updated · Methodology
Mechanism
Rifampicin strongly induces CYP3A4 – the main N-deethylation pathway of amiodarone. Amiodarone and N-desethyl-amiodarone plasma levels fall by about 50%; antiarrhythmic effect weakens.
Symptoms
Atrial fibrillation symptoms return: palpitations, irregular pulse, fatigue, dyspnoea. Rhythm breakthroughs may require admission.
Management
During anti-TB therapy, replace amiodarone with a beta-blocker for rate control or plan catheter ablation. Induction persists for 2 weeks after rifampicin stops – restart amiodarone gradually.
Check the full regimen, not just this pair
Opens the checker with these two drugs prefilled. Add the rest of the regimen and recompute additive risks.
Summary of a multi-drug list →
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Sources
- FDA: Rifampin capsule (Ani Pharmaceuticals, Inc.) – Prescribing Information (2010)– ; DailyMed setid b389b1a3-672f-47e3-916c-4a9c044b211b