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Pharmacology · single question

On a dose-response curve, which drug is MORE POTENT?

  1. The drug with higher maximum efficacy
  2. The drug reaching 50% max effect at a LOWER dose (leftward shift)
  3. The drug with the steeper slope
  4. The drug that achieves 100% maximum effect
Show answer and explanation

Correct answer: B. The drug reaching 50% max effect at a LOWER dose (leftward shift)

Potency = dose required for 50% max effect (EC50). MORE potent = same effect at LOWER dose = leftward shift on dose-response curve. Efficacy (max effect) is a separate concept from potency.

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