Metoprolol Tartrate Dosing for Adults
For acute coronary syndromes (STEMI/NSTEMI), start with intravenous metoprolol 5 mg every 5 minutes for up to 3 doses (15 mg total), then transition to oral metoprolol tartrate 25-50 mg every 6 hours for 48 hours, followed by maintenance dosing of 100 mg twice daily, titrating to a target of 200 mg daily as tolerated. 1, 2, 3
Acute Coronary Syndrome (STEMI/NSTEMI) Dosing
Intravenous Loading Phase
- Initial IV dose: 5 mg administered slowly over 1-2 minutes 2, 3
- Repeat: Every 5 minutes for up to 3 total doses (15 mg cumulative) 2, 3
- Monitoring required: Continuous ECG, frequent blood pressure and heart rate checks, auscultation for rales and bronchospasm 2
Transition to Oral Therapy
- Timing: 15 minutes after the last IV dose 2, 3
- Initial oral dose: 25-50 mg every 6 hours for 48 hours 1, 2, 3
- Maintenance dose: 100 mg twice daily thereafter 1, 2
- Target dose: Titrate to 200 mg daily total as tolerated 1
Alternative Oral-Only Initiation
If IV administration is not indicated or safe, start with oral metoprolol tartrate at reduced doses (12.5-25 mg) within the first 24 hours 2
Heart Failure with Reduced Ejection Fraction (HFrEF)
Starting and Titration Schedule
- Initial dose: 12.5 mg twice daily 4, 5
- Titration interval: Increase weekly or every 1-2 weeks 6, 4
- Target dose: 200 mg daily (100 mg twice daily) 7
- Minimum effective dose: At least 50% of target (100 mg daily total) should be achieved if tolerated 7
Note: Metoprolol succinate (extended-release) is preferred over tartrate for heart failure, with a starting dose of 12.5-25 mg once daily, titrated to 200 mg once daily 6, 7, 4, 7. However, metoprolol tartrate has demonstrated efficacy when titrated appropriately 5, 8.
Hypertension
Standard Dosing
- Starting dose: 100 mg once daily 9
- Usual range: 100-200 mg daily, administered once or twice daily 10, 11
- Maximum dose: 400 mg daily in divided doses 10
- Titration: Increase at 2-week intervals based on blood pressure response 11
Both once-daily and twice-daily regimens are effective, with no significant difference in blood pressure control 9
Atrial Fibrillation Rate Control
Intravenous Administration
- Dose: 2.5-5 mg IV bolus over 2 minutes 12, 13
- Repeat: Up to 3 doses as needed 12, 13
- Onset: 5 minutes 12, 13
Oral Maintenance
Critical Contraindications and Precautions
Absolute Contraindications to Acute Beta-Blockade
- Signs of heart failure (rales, S3 gallop) 1, 2
- Evidence of low output state (oliguria) 2
- Systolic blood pressure <90 mmHg 2
- Heart rate <50 bpm 2
- PR interval >0.24 seconds 1
- Second- or third-degree heart block without pacemaker 1, 2
- Active asthma or severe reactive airways disease 1, 2
High-Risk Features for Cardiogenic Shock
Avoid IV beta-blockers if patient has: age >70 years, systolic BP <120 mmHg, sinus tachycardia >110 bpm, heart rate <60 bpm, or prolonged time since symptom onset 1
Patients with tachycardia or Killip Class II-III are at highest risk for cardiogenic shock with IV beta-blockade 2
Special Populations
Chronic Obstructive Pulmonary Disease
Use cautiously with low doses of cardioselective agent (12.5 mg metoprolol orally) rather than complete avoidance 2
Hepatic Impairment
Initiate at low doses with cautious gradual titration, as metoprolol levels increase substantially with hepatic dysfunction 3
Renal Impairment
No dose adjustment required 3
Elderly Patients (>65 years)
Use low initial starting doses given greater frequency of decreased hepatic, renal, or cardiac function 3
Target Heart Rate
The goal resting heart rate is 50-60 beats per minute unless limiting side effects occur 2