MajorClass III antiarrhythmics (Vaughan Williams)×Non-selective beta blocker
Updated · Methodology
Mechanism
Additive bradycardia and AV conduction suppression. Propranolol is non-selective, with higher risk than bisoprolol (affects β2 receptors, potentially causing bronchospasm in asthma).
Symptoms
Bradycardia (heart rate below 50/min), dizziness, syncope. ECG: first- to second-degree AV block. Older patients: fall risk.
Management
The combination is appropriate in cardiology. Reduce propranolol by 25–50% when starting amiodarone. Check pulse and ECG at 1 and 4 weeks. In asthma or COPD, a selective beta-blocker (bisoprolol) is preferred.
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 →
Medicine list: everything you take in one place →
Sources
- FDA: Amiodarone hydrochloride tablet (Dr. Reddy's Labratories Inc.) – Prescribing Information (2018)– ; DailyMed setid 95cef33b-c0e6-b17c-7cbb-f5c066872705
- AEMPS: Ficha técnica: Propranolol (nº registro 89692), sección 4.5 (2026)– AEMPS, CIMA, nº registro 89692, revisión 05/2026, sección 4.5