Maximum Dose of Metoprolol
The maximum recommended daily dose is 400 mg for metoprolol tartrate (immediate-release) and 200 mg for metoprolol succinate (extended-release). 1
Formulation-Specific Dosing
Metoprolol Tartrate (Immediate-Release)
- Maximum dose: 400 mg daily 1
- Typically administered in divided doses (twice daily or more frequently) 1
- In clinical hypertension and angina trials, oral dosages ranged from 100-450 mg daily, though 400 mg is the standard maximum 1
Metoprolol Succinate (Extended-Release)
- Maximum dose: 200 mg once daily 2
- This is the target dose established in the landmark MERIT-HF trial for heart failure 2, 3
- The controlled-release formulation delivers metoprolol at a near-constant rate over approximately 20 hours, maintaining consistent beta-1 blockade throughout the 24-hour period 4
Clinical Context for Maximum Dosing
Heart Failure with Reduced Ejection Fraction (HFrEF)
- Target dose: 200 mg once daily of metoprolol succinate extended-release 2
- In MERIT-HF, 64% of patients achieved the 200 mg target dose 3
- Mean dose achieved in clinical trials was 159 mg total daily 2
- Initiate at 12.5-25 mg once daily and titrate upward every 2 weeks 2, 3
Hypertension and Angina
- Metoprolol tartrate: doses up to 400 mg daily have been used effectively 1
- Most patients achieve blood pressure control at 200 mg daily 5
Myocardial Infarction
- Acute phase: 15 mg IV total (three 5 mg boluses), followed by 50 mg orally every 6 hours for 48 hours 1
- Maintenance: 100 mg orally twice daily (200 mg total daily) 1
Important Dosing Considerations
Hepatic impairment requires cautious dose titration starting at low doses, as metoprolol blood levels increase substantially with liver dysfunction (elimination half-life can extend up to 7.2 hours) 1. The drug is primarily eliminated by hepatic metabolism via CYP2D6 1.
Poor CYP2D6 metabolizers (approximately 8% of Caucasians) exhibit several-fold higher plasma concentrations and may require lower maximum doses to avoid excessive beta-blockade 1. These patients may have 30-40% of the dose excreted unchanged in urine versus less than 10% in extensive metabolizers 1.
Renal impairment does not require dose adjustment, as the systemic availability and half-life remain clinically similar to normal subjects 1.
Cardioselectivity at Higher Doses
Beta-1 selectivity is maintained at doses up to 200 mg daily of metoprolol succinate 4. However, at higher doses, metoprolol becomes progressively less selective and exhibits more beta-2 blockade 6. This loss of selectivity is clinically relevant for patients with reactive airway disease or peripheral vascular disease.