Which describe the desired effect of a drug, or the reason the drug is administered?

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The desired effect of a drug is referred to as its therapeutic effect. This is the reason the drug is administered - to achieve a specific treatment outcome. A side effect refers to any unintended effect of the drug, while a local effect is a response that is specific to the site of administration. A systemic effect refers to a response that affects the entire body, rather than a localized area.

Which Describe the Desired Effect of a Drug, or the Reason