Drug Distribution · Pharmacology

What is the clinical significance of 'Displacement' in the context of plasma protein binding?

  1. It causes the drug to become permanently inactivated
  2. Another drug displaces it from albumin, raising its free fraction and toxicity
  3. It permanently prevents the displaced drug from undergoing renal glomerular filtration
  4. It increases the half-life of both drugs involved
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Correct answer: Another drug displaces it from albumin, raising its free fraction and toxicity

If Drug A is highly bound to albumin and Drug B is added, Drug B may displace Drug A. This results in a sudden increase in the 'free' (active) concentration of Drug A, which may lead to toxic effects even if total drug levels remain unchanged.

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