The point in time on the drug concentration curve that indicates the first sign of a therapeutic effect is the:

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The onset of action is the point in time on the drug concentration curve where the drug first starts to produce a therapeutic effect. This is different from the peak of action, which is the point of maximum effect, and the therapeutic range, which is the range of drug concentrations where the desired therapeutic effect is achieved without causing unacceptable adverse effects. The minimum adverse effect level is the lowest concentration of drug at which adverse effects occur.

The Point in Time on the Drug Concentration Curve That