Drug Distribution · Pharmacology

Which of the following describes the 'Volume of Distribution' (Vd) of a drug?

  1. The actual anatomical volume occupied by the liver, kidneys, and spleen combined
  2. A theoretical volume relating total drug in the body to plasma concentration
  3. The total amount of blood pumped by the heart each minute
  4. The volume of the GI tract where the drug is absorbed
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Correct answer: A theoretical volume relating total drug in the body to plasma concentration

Vd is a pharmacokinetic parameter used to quantify the extent of drug distribution. It represents the volume required to contain the total amount of drug at the same concentration as that found in the plasma.

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