Paper I
2024 December (Supplementary) (2019 Scheme) · 100 marks · 180 min

Question

The following are the examples of idiosyncrasy:

  1. Chloramphenicol producing aplastic anemia
  2. Aspirin producing gastric irritation
  3. INH producing hepatotoxicity
  4. Atypical pseudocholinesterase resulting in succinylcholine apnea
  • a) 1 & 3
  • b) 2 & 4
  • c) 1 & 4
  • d) 2 & 3
Qvi1 marksMCQs

Answer

Correct answer: c) 1 & 4

Idiosyncrasy is a genetically determined, qualitatively abnormal reaction unrelated to the drug’s known pharmacological action. Chloramphenicol-induced aplastic anemia and atypical pseudocholinesterase causing prolonged succinylcholine apnea are both classic idiosyncratic reactions. Aspirin-induced gastric irritation is a direct, dose-related pharmacological (Type A) toxic effect, and INH hepatotoxicity is a predictable, dose/exposure-related toxicity — neither is a true idiosyncratic reaction.

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