Which of the following represents an idiosyncratic adverse reaction to a medication?

Pharmaceutical Chemistry Mcqs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Published
5 Apr 2022
Last updated
28 May 2026

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Explanation

An idiosyncratic adverse drug reaction is an uncommon, unpredictable response that is not dose-dependent and occurs due to individual genetic differences. Insomnia following pentobarbitone intake is considered idiosyncratic because it is an unusual and paradoxical reaction. In contrast, muscle dystonia from triflupromazine, asthma triggered by morphine, and gum hyperplasia caused by phenytoin are more predictable and well-known side effects.

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