What phrase best describes pharmacodynamics?
1. The potency of a drug
2. What the body does to a drug
3. How a drug exerts its effects
4. The efficacy of a drug
Correct Answer: 3
Rationale 1: The potency of a drug is incorrect because how a drug exerts its effects is pharmacodynamics.
Rationale 2: What the body does to a drug is incorrect because this is the definition of pharmacokinetics.
Rationale 3: How a drug exerts its effects is pharmacodynamics.
Rationale 4: The efficacy of a drug is incorrect because how a drug exerts its effects is pharmacodynamics.
Global Rationale: How a drug exerts its effects is pharmacodynamics. The potency of a drug is incorrect because how a drug exerts its effects is pharmacodynamics. What the body does to a drug is incorrect because this is the definition of pharmacokinetics. The efficacy of a drug is incorrect because how a drug exerts its effects is pharmacodynamics.
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