Efficacy (of a drug or treatment)

What is Efficacy (of a drug or treatment)?

Efficacy (of a drug or treatment) meaning Whether a drug or other treatment works under the best possible conditions. In a research study about efficacy, the study participants are carefully selected, and the researchers can make sure the drug is taken properly and stored properly. The study participants may differ from other people in the general public who have the disease. A treatment that has efficacy under the best conditions may not work as well in a different group of people with the same disease.


reference: national Cancer Institute – Glossary for Registrars

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