"Potency refers to the amount of drug (usually expressed in milligrams) needed to produce an effect, such as relief of pain or reduction of blood pressure. For instance, if 5 milligrams of drug A relieves pain as effectively as 10 milligrams of drug B, drug A is twice as potent as drug B."
Source: https://www.merckmanuals.com/home/drugs/drug-dynamics/drug-action
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