Paper I
2013 September (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Nasal decongestants

Q53 marksShort Notes

Answer

Nasal decongestants are sympathomimetic drugs that relieve nasal congestion by causing vasoconstriction of the nasal mucosal blood vessels (α1-adrenergic agonist action), reducing mucosal oedema/blood flow.

Examples

  • Topical: Oxymetazoline, Xylometazoline, Phenylephrine (nasal drops/sprays)
  • Systemic: Pseudoephedrine, Phenylephrine (oral)

Uses

  • Symptomatic relief of nasal congestion in common cold, allergic rhinitis, sinusitis

Adverse effects

  • Rebound nasal congestion (rhinitis medicamentosa) with prolonged topical use (>5–7 days)
  • Systemic absorption can cause hypertension, tachycardia, CNS stimulation (insomnia, nervousness)
  • Caution in hypertensive patients and those on MAO inhibitors

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