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

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The dose of drug that produces the effect desired in half of the subjects is called the drug's ED50, also known as the median effective dose. This is a measure of a drug's potency and is used to determine the appropriate dosing for patients. Half-life refers to the amount of time it takes for half of a drug to be eliminated from the body, while therapeutic index is a measure of a drug's safety and effectiveness. LD₅₀ is not a recognized term in pharmacology.

The Dose of Drug That Produces the Effect Desired in Half