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Drug Efficacy

Meaning

Drug Efficacy is the quantitative measure of a pharmaceutical agent’s ability to produce the maximum possible desired therapeutic effect under optimal conditions, typically observed within the controlled environment of a clinical trial. It reflects the inherent biological activity of the drug, establishing the upper limit of the clinical response it can elicit, irrespective of the dose required to achieve that response. Efficacy is a fundamental parameter used by clinicians to select the most appropriate therapeutic class for a specific patient condition.