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Compound Evidence InstituteEvidence synthesis · established 2023Graded assessments of compounds, trials, methods and supply
Document set current to 30 July 2026
Defined term · Outcomes and endpoints

Efficacy

The effect of an intervention under the conditions of a controlled trial, in a selected population with protocol-driven adherence and follow-up.

Document identifier
CEI-GT-031
Series
Defined term
Version
1.0
Published
30 Jul 2026
Last reviewed
30 Jul 2026
Certainty
Not rated

§1Efficacy

§1.2Category

Outcomes and endpoints — Terms describing what a study measures and what the measurement supports.

§1.3Related terms

  • Effectiveness — The effect of an intervention under ordinary conditions of use. Generally smaller than efficacy, principally because adherence and persistence outside a trial are lower.
Compound Evidence Institute · CEI-GT-031 · https://compoundevidence.com/glossary/efficacy/ · retrieved 30 July 2026
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