Pharmacology · single question

What happens to most drugs when they are metabolized (biotransformed) in the liver?

  1. Their pharmacologic effect is increased
  2. Their lipid solubility is increased
  3. Their water (hydro) solubility is increased, facilitating renal excretion
  4. Their molecular weight is decreased
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Correct answer: C. Their water (hydro) solubility is increased, facilitating renal excretion

Hepatic metabolism (Phase I oxidation/reduction and especially Phase II conjugation) generally converts lipophilic drugs into more polar, water-soluble metabolites so the kidneys can excrete them. Most metabolites are less active, though some drugs form active metabolites (see the diazepam question below).

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