Paper I
2021 December (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Metoprolol

Q43 marksShort Notes

Answer

Metoprolol is a β1-selective (cardioselective) beta blocker.

Mechanism of action

  • Selectively blocks β1 receptors, reducing heart rate, myocardial contractility, and renin release, with relatively less effect on β2 receptors (bronchial/vascular smooth muscle) than non-selective agents

Uses

  • Hypertension
  • Angina pectoris
  • Heart failure (specific formulations, e.g., metoprolol succinate — improves survival)
  • Arrhythmias
  • Post-MI secondary prevention

Adverse effects

  • Bradycardia, heart block
  • Fatigue, cold extremities
  • Masking hypoglycaemia symptoms in diabetics
  • Bronchospasm (less than non-selective agents but can occur at higher doses)
  • Rebound hypertension/tachycardia with abrupt withdrawal

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