📌 Medicine Name:
Metoprolol Injection 1 mg/mL
(Usually as Metoprolol Tartrate – short-acting form for IV use)
📋 Description / Prescription:
Metoprolol Injection is a prescription-only, sterile intravenous (IV) beta-blocker formulation used in acute cardiovascular conditions requiring rapid heart rate or blood pressure control.
🔹 Form: Clear, colorless sterile solution
🔹 Strength: 1 mg/mL
🔹 Route: Intravenous (IV) only
🔹 Pack: Ampoules or vials – typically 5 mL or 10 mL per unit
🩺 Indications:
Used in hospital/emergency settings for:
- Supraventricular tachycardia (SVT)
- Atrial fibrillation/flutter with rapid ventricular response
- Acute myocardial infarction (MI) – early intervention
- Hypertensive emergency (rare use)
- Intraoperative and postoperative tachycardia/hypertension
🔬 Nature / Mechanism of Action:
Metoprolol is a cardioselective beta-1 adrenergic blocker, which:
- Slows heart rate (negative chronotropic effect)
- Reduces myocardial oxygen demand
- Lowers blood pressure
- Controls arrhythmias
In IV form, it acts rapidly, with onset in 1–2 minutes, and a short half-life (~3–7 hours).
✅ Advantages / Therapeutic Benefits:
- ✅ Rapid control of tachycardia and hypertension
- ✅ Reduces risk of reinfarction and mortality post-MI
- ✅ Beneficial in acute care when oral beta-blockers are not possible
- ✅ Useful for rate control in critically ill or perioperative patients
📦 Packaging:
- Supplied in 1 mg/mL concentration
- Ampoules (usually 5 mL = 5 mg)
- Vials (may be preservative-free for single use)
- Boxed in cartons of 5–10 ampoules/vials
🌡️ Storage:
- Store at 15–25°C (59–77°F)
- Protect from light and freezing
- Use immediately after opening (single-use vials)
- Discard unused portion
⚠️ Precautions / Warnings:
Contraindicated in:
- Bradycardia
- Heart block (2nd or 3rd degree)
- Severe heart failure (uncontrolled)
- Cardiogenic shock
- Hypotension
⚠️ Use with caution in:
- Asthma/COPD (may cause bronchospasm)
- Diabetes (masks hypoglycemia signs)
- Hepatic impairment
Monitor:
- Heart rate
- Blood pressure
- ECG
- Signs of bronchospasm
🧪 Drug Interactions:
- Other negative chronotropes (e.g., diltiazem, digoxin)
- IV calcium channel blockers – avoid co-administration
- May interact with anesthetics during surgery
👩⚕️ Patient Advice / Counseling (for caregivers or post-IV transition):
- IV Metoprolol is for hospital/clinical use only
- After stabilization, switch to oral metoprolol for long-term therapy
- Instruct on blood pressure and pulse monitoring post-transition
- Educate patient on signs of low heart rate, fatigue, dizziness, and when to report
- Avoid abrupt cessation of therapy