Tapering Metoprolol When Transitioning to Carvedilol

Key Principles

The American College of Cardiology recommends avoiding abrupt cessation of all beta-blockade, as it can cause severe exacerbation of angina, myocardial infarction, ventricular arrhythmias, and rebound hypertension, particularly in patients with coronary artery disease, with a mortality rate of 50% in some studies 1
The European Heart Journal recommends a gradual reduction of beta-blocker dose to prevent withdrawal phenomena, including rebound increase in cardiac chronotropic sensitivity, rebound rise in resting heart rate, and rebound hypertension, but this is not necessary when another beta-blocker maintains continuous blockade 1

Ensure carvedilol is dosed at least 12.5 mg twice daily (50% of target dose) or higher, with a target dose of 25 mg twice daily for most patients, and a maximum dose of 50 mg twice daily for patients over 85 kg with heart failure, as recommended by the European Society of Cardiology 2
Simply stop the metoprolol without tapering once carvedilol is at therapeutic dose, as demonstrated by the COMET post-study phase, which showed a low adverse event rate of 3.1% in patients switching from metoprolol to carvedilol 2

Standard metoprolol tapering (reducing dose by 25-50% every 1-2 weeks) is only necessary when discontinuing all beta-blockade, as recommended by the American Heart Association 1

If carvedilol dose is subtherapeutic (<12.5 mg BID), consider increasing carvedilol first before stopping metoprolol, or reduce metoprolol by 50% initially, as recommended by the Heart Failure Society of America 2
If patient has severe heart failure (NYHA class IV), reduce metoprolol by 50% first, monitor for 1-2 weeks, then discontinue completely, as recommended by the European Society of Cardiology 3
If patient has recent acute coronary syndrome, ensure clinical stability for at least 4 weeks before making changes, as recommended by the American College of Cardiology 3
Do not stop metoprolol abruptly (even with carvedilol coverage) if patient has unstable angina or recent MI within 4 weeks, signs of decompensated heart failure are present, or systolic BP <100 mmHg or heart rate <50 bpm, as recommended by the American Heart Association 1, 3, 4