What defines the therapeutic range of a drug?

The therapeutic range of a drug is defined by the concentration range for effective drug action. This range indicates the levels of the drug in the bloodstream that produce the desired therapeutic effect without leading to toxicity. Within this range, the drug is more likely to be effective for treating the condition for which it is prescribed, while concentrations below this range may not be sufficient to achieve the desired effect, and those above it might increase the risk of adverse effects or toxicity.

The therapeutic range is critical for optimizing drug therapy and ensuring patient safety, as it helps guide dosages to maintain effective treatment. Understanding this concept is essential for healthcare professionals to provide effective medication management.