Paper I
2019 February (2010 Scheme) · 40 marks · 120 min

Question

Cetirizine

Q53 marksShort Notes

Answer

Cetirizine is a second-generation H1-receptor antihistamine.

Mechanism of action

  • Selectively blocks peripheral H1 receptors, preventing histamine-mediated effects (vasodilatation, increased vascular permeability, bronchoconstriction, itching)
  • Poorly crosses the blood-brain barrier — minimal sedation compared to first-generation agents

Uses

  • Allergic rhinitis, urticaria, allergic conjunctivitis

Adverse effects

  • Mild sedation (more than other second-generation agents, less than first-generation)
  • Dry mouth, headache
  • Generally well tolerated, once-daily dosing

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