The dose of drug that produces the effect desired in half of subjects is called the drug's:

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The ED50 (effective dose 50) is the dose of a drug that produces the desired effect in 50% of the subjects. This is a measure of a drug's potency and can be used to determine the appropriate dose for therapeutic use. The half-life is the amount of time it takes for half of the drug to be eliminated from the body, the therapeutic index is the ratio of the toxic dose to the therapeutic dose, and the LD50 is the dose of a drug that is lethal in 50% of subjects.

The Dose of Drug That Produces the Effect Desired in Half