EC50 is the concentration that produces what fraction of maximal effect?

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Multiple Choice

EC50 is the concentration that produces what fraction of maximal effect?

Explanation:
EC50 is the concentration that yields half of the maximal effect. On a dose–response curve that goes from no effect to Emax, the EC50 marks the point where the response is Emax/2, i.e., 50% of the maximum. This is also why EC50 is a measure of potency: a lower EC50 means you need less drug to reach half-maximal response. The other fractions correspond to different points on the curve (zero, near-max, or mid-high), not the halfway point, so they are not EC50.

EC50 is the concentration that yields half of the maximal effect. On a dose–response curve that goes from no effect to Emax, the EC50 marks the point where the response is Emax/2, i.e., 50% of the maximum. This is also why EC50 is a measure of potency: a lower EC50 means you need less drug to reach half-maximal response. The other fractions correspond to different points on the curve (zero, near-max, or mid-high), not the halfway point, so they are not EC50.

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