Metoprolol Dosage and Administration for Paroxysmal Atrial Fibrillation
Dosing Guidelines
- The American Heart Association recommends an initial oral dose of metoprolol for paroxysmal atrial fibrillation of 25 to 100 mg twice daily 1, 2
- For non-acute setting and chronic maintenance therapy, metoprolol should be dosed at 25 to 100 mg twice daily orally, as recommended by the American College of Cardiology 1, 2
- In the acute setting, metoprolol can be administered intravenously as 2.5 to 5 mg IV bolus over 2 minutes, up to 3 doses, according to the American Heart Association 1, 2, 4
- Extended-release metoprolol succinate (XL) can be dosed at 50-400 mg once daily for patients requiring more consistent 24-hour coverage, as suggested by the American College of Cardiology 2
Therapeutic Goals
- The target resting heart rate should be less than 80 bpm for symptomatic management of AF, as recommended by the American College of Cardiology 2
- A lenient rate control strategy (resting heart rate <110 bpm) may be reasonable for asymptomatic patients with preserved left ventricular function, according to the American Heart Association 2
- Beta blockers are recommended as Class I (Level of Evidence B) for ventricular rate control in paroxysmal, persistent, or permanent AF, by the American College of Cardiology 2
Monitoring and Titration
- Assess heart rate control during exertion, adjusting pharmacological treatment as necessary, as recommended by the American College of Cardiology 2
- Dose should be adjusted based on patient response and tolerability, according to the American Heart Association 1, 2