Metoprolol tartrate is a selective β₁‑adrenergic receptor blocker used for several cardiovascular conditions such as hypertension, angina, post‑myocardial infarction (MI), heart failure, and certain arrhythmias. Because the appropriate dose depends on the specific indication, patient age, kidney/hepatic function, and comorbidities, the following figures are only general reference values. Always follow your prescriber’s orders and the product label.
| Condition | Typical Starting Dose | Usual Maintenance Dose | Maximum Daily Dose |
|----------------|---------------------------|----------------------------|------------------------|
| Hypertension (adults) | 12.5 mg orally twice daily (25 mg/day) | 25–50 mg BID (50–100 mg/day) | 400 mg/day |
| Angina pectoris (adults) | 12.5 mg PO BID | 25–50 mg BID (50–100 mg/day) | 400 mg/day |
| Post‑MI prophylaxis (adults) | 25 mg PO BID (or 50 mg daily) | 50–100 mg BID (100–200 mg/day) | 400 mg/day |
| Heart failure (adults) | 12.5–25 mg PO BID | 25–100 mg BID (50–200 mg/day) | 400 mg/day |
| Supraventricular tachycardia (acute) | 50 mg PO once | 50 mg PO 2–4 hrs after | 200 mg/day (for chronic) |
| Beta‑blocker naive adults | 12.5 mg PO BID | ↑ 25 mg BID after 1‑2 weeks | 400 mg/day |
| Elderly (>65 yrs) | 12.5 mg PO BID | ↑ 25 mg BID after 1‑2 weeks | 200–400 mg/day |
| Children (≥6 yrs) | 0.5–1 mg/kg/day divided | 1–2 mg/kg/day divided | ≤2 mg/kg/day |
| Infants (<6 yrs) | 0.25 mg/kg/day divided | 0.5 mg/kg/day divided | ≤2 mg/kg/day |
Key points for dosing
1. Start low, go slow – most patients begin at the lowest dose (12.5 mg BID) and titrate upward every 1–2 weeks, monitoring heart rate, blood pressure, and symptom control.
2. Monitor – watch for bradycardia, hypotension, fatigue, dizziness, or worsening heart failure symptoms after dose changes.
3. Renal/hepatic impairment – dose adjustments may be required, especially in severe kidney disease. For mild–moderate hepatic impairment, most clinicians continue the standard dose but monitor closely.
4. Drug interactions – avoid sudden discontinuation if on other antihypertensives or digoxin. Concomitant use with calcium channel blockers or other β‑blockers can increase risk of bradycardia and heart block.
5. Pregnancy – generally avoided unless benefits outweigh risks. Discuss with a healthcare provider.
When to seek medical help
- Severe hypotension (SBP < 90 mmHg) or dizziness that doesn’t improve with dose adjustment.
- Bradycardia (< 50 bpm) or heart block.
- Signs of heart failure exacerbation: swelling, shortness of breath, fatigue.
- Unexplained rash or itching (possible allergic reaction).
Bottom line
- Adults: start 12.5–25 mg BID, titrate to 50–100 mg BID (max 400 mg/day).
- Elderly: lower starting dose, maximum 200–400 mg/day.
- Children: dose by weight (0.5–2 mg/kg/day).
These are only typical ranges. Your actual dose may differ based on your medical history, other medications, and your doctor’s judgment. Always follow your prescriber’s instructions and talk to a healthcare professional before making any changes.