There are two kinds of dose-response curves. One type, discussed in this section, plots the intensity of response against the dose of the drug. We now consider a dose-response curve in which the percentage of subjects showing a specific response is plotted against the dose of the drug. In Problems the curve on the left shows the percentage of subjects exhibiting the desired response at the given dose, and the curve on the right shows the percentage of subjects for which the given dose is lethal.

In Figure 4.84, discuss the possible outcomes and what percent of patients fall in each outcome when 50 mg of the drug is administered.

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percent of patients showing given response 100 80 60 40 20 Percent effective 2 Percent lethal 20 40 60 80 Figure 4.84 dose (mg)