If Drug A has an ED50 of 5 mg and Drug B has an ED50 of 50 mg, and both reach the same Emax, which is true?
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Correct answer: Drug A is more potent than Drug B
Potency is inversely related to the $ED_{50}$. Because Drug A requires a much lower dose to achieve the same effect level as Drug B, Drug A is considered more potent.
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