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Only the unbound part of a drug can reach receptors. Bound drug is therefore:

AInflatable
BInactive
CInsoluble
DInvisible
Answer & Solution
Correct answer: B. Inactive
1. Bound drug is stuck to plasma protein. 2. It cannot cross into tissue. 3. So it is inactive. _Source: OpenStax Pharmacology for Nurses, Chapter 2, Drug Administration and Pharmacokinetics._
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