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

Question

The factor which does not govern the volume of distribution of a drug is

  • a) Lipid: water partition coefficient ratio
  • b) First pass metabolism
  • c) Congestive cardiac failure
  • d) Plasma protein binding
Qiv1 marksMCQs

Answer

Correct answer: b) First pass metabolism

Volume of distribution is governed by lipid:water partition coefficient (tissue penetration), plasma protein binding (highly bound drugs stay confined to plasma, lowering Vd), and conditions altering body fluid compartments such as congestive cardiac failure (fluid overload can increase Vd for some drugs). First-pass metabolism affects how much drug reaches systemic circulation (bioavailability) and its clearance, not how the drug that does reach circulation subsequently distributes into tissues.

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