Bisoprolol vs Metoprolol
Drug Class
Beta-1 selective beta-blocker
Beta-1 selective beta-blocker
Indications
- Hypertension - Chronic heart failure - Stable angina
- Hypertension - Chronic heart failure - Angina - Myocardial infarction prevention - Atrial fibrillation
Mechanism of Action
Blocks beta-1 adrenergic receptors, reducing heart rate and cardiac workload.
Blocks beta-1 adrenergic receptors, reducing heart rate, cardiac output, and oxygen demand.
Dosage Forms
Oral tablets (e.g., 5 mg, 10 mg)
Oral tablets (e.g., 25 mg, 50 mg, 100 mg); Extended-release tablets (e.g., 25 mg, 50 mg, 100 mg, 200 mg)
Dosing Frequency
Once daily
Immediate-release: 2–3 times daily Extended-release: Once daily
Bioavailability
~80%
~50% (immediate-release); ~60–70% (extended-release)
Half-life
~9–12 hours
~3–7 hours (immediate-release); ~5–7 hours (extended-release)
Metabolism
Liver metabolism via CYP3A4
Liver metabolism via CYP2D6
Excretion
Renal and fecal (50% unchanged in urine)
Renal and fecal (mostly as metabolites)
Special Populations
Requires dose adjustment in renal impairment.
Caution in severe hepatic impairment.
Common Side Effects
- Fatigue - Bradycardia - Dizziness - Cold extremities - Nausea
- Fatigue - Bradycardia - Dizziness - Hypotension - Depression
Serious Side Effects
- Severe bradycardia - Heart block - Bronchospasm
- Severe bradycardia - Heart block - Worsening heart failure - Bronchospasm
Pregnancy Category
Category C (Risk cannot be ruled out)
Category C (Risk cannot be ruled out)
Lactation
Use with caution; limited data available.
Use with caution; excreted in breast milk.
Drug Interactions
- Calcium channel blockers (e.g., Verapamil, Diltiazem) - Digoxin - Insulin - NSAIDs - CYP3A4 inhibitors
- Calcium channel blockers - Digoxin - Insulin - NSAIDs - CYP2D6 inhibitors
Effect on Heart Rate
Strongly decreases heart rate
Decreases heart rate (may vary between forms)
Preferred Usage
Often preferred for chronic heart failure due to longer half-life and once-daily dosing.
Often used post-MI or in atrial fibrillation due to immediate-release forms and higher flexibility.
Brand Names
Zebeta (common brand)
Lopressor (immediate-release), Toprol-XL (extended-release)
Cost (Generic)
Generally affordable
Generally affordable, extended-release forms may cost more.
Key Differences
Longer half-life and steady effect make it suitable for once-daily dosing.
More flexibility in dosing frequency; extended-release offers smoother effect.
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