Major
carvedilol × Verapamil
Alpha and beta blocker (non-selective β + α1)×Non-dihydropyridine calcium channel blocker
Mechanism
Non-dihydropyridine calcium channel blocker (verapamil) + beta-blocker (carvedilol) – additive AV node blockade and negative inotropic effect. Carvedilol has additional α1-blockade, amplifying hypotension.
Symptoms
Bradycardia (heart rate below 50/min), dizziness, syncope. ECG: first- to second-degree AV block. Older patients: fall risk.
Management
Avoid the combination. For atrial fibrillation rate control, choose carvedilol + digoxin (instead of verapamil), or verapamil with carvedilol withdrawn. In heart failure, carvedilol is preferred (benefit proven in COPERNICUS and CIBIS).
Sources
- ESC: 2021 ESC Guidelines for the diagnosis and treatment of acute and chronic heart failure (2021)– Eur Heart J 2021;42(36):3599–3726