Glossary · Pharmacology

AUC (Area Under the Curve)

Also called: Area Under the Curve.

Definition: AUC is the area under the plasma concentration-vs-time curve for a drug, representing total drug exposure over a dosing interval. AUC is used in pharmacokinetic studies to compare formulations and routes; bioequivalence determinations rely on AUC and Cmax falling within acceptable ranges.

Detailed definition

AUC quantifies cumulative drug exposure over time. It is calculated by integrating the plasma concentration-vs-time curve, typically from time 0 to infinity (AUC0-∞) or over a dosing interval (AUCτ). AUC is proportional to total drug dose absorbed and inversely proportional to clearance. Bioequivalence between two formulations of the same drug requires AUC and Cmax ratios within FDA-defined acceptable ranges (typically 80–125%). For estradiol pharmacokinetic studies, AUC over 24 hours (or 7 days for once-weekly patches) compares cumulative exposure across formulations and routes.

Why it matters in menopause

AUC is most relevant when interpreting pharmacokinetic comparisons in research. For routine clinical care, the practical implications of AUC differences are reflected in the selection of dose and route at the prescribing decision.

Sources

External references: Wikipedia.

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