Bisoprolol vs Metoprolol: Which Beta-Blocker is Right for You?
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.