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

Question

Assertion (A): Levodopa is combined with carbidopa. Reason (R): Levodopa-carbidopa combination reduces involuntary movements and postural hypotension.

  • a) Both A and R are true, and R is the correct explanation of A
  • b) Both A and R are true, and R is not the correct explanation of A
  • c) A is true, but R is false
  • d) A is false, but R is true
Qxix1 marksMCQs

Answer

Correct answer: c) A is true, but R is false

A is true — levodopa is always combined with carbidopa in clinical practice. R is false as a complete statement: the combination does reduce peripheral adverse effects like postural hypotension (by permitting a much lower levodopa dose, since peripheral decarboxylation is blocked), but it does not reduce involuntary movements (dyskinesias) — dyskinesias are a central dopaminergic effect that can still occur, and may even be more prominent, because carbidopa increases the fraction of levodopa reaching the CNS.

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