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

Question

Naloxone / Nalbuphine in morphine poisoning

Q140.3 marksShort Answers

Answer

Chosen drug: Naloxone

Justification: Naloxone is a pure, competitive opioid receptor antagonist with no agonist activity, making it the appropriate choice to reverse morphine-induced respiratory depression and CNS depression in overdose/poisoning. Nalbuphine, in contrast, is a mixed opioid agonist-antagonist (κ-agonist/μ-partial antagonist) that itself has some agonist activity and analgesic/sedative effects — it is not a full antagonist and is unsuitable for completely reversing severe morphine toxicity. Naloxone’s pure antagonism ensures rapid, complete reversal of the life-threatening effects of morphine overdose.

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