Distinguish between a drug's "therapeutic index" and its "therapeutic window" (assuming the latter applies).

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The Answer is The therapeutic index, i.e., the ratio of a drug's LD50 to its ED50, is a gross measure of the drug's safety, whereas a drug's therapeutic window refers to the plasma concentration levels of the drug that are clinically effective, with levels below or above those levels being ineffective.

Distinguish Between a Drug's "Therapeutic Index" and Its "Therapeutic Window