0 the ability, especially of a medicine or a method of achieving something, to produce the intended result:
They recently ran a series of tests to measure the efficacy of the drug.
The clinical report shows results of almost 95% efficacy for the vaccine.
Of course, the efficacy of any drug in a study will be different from its actual performance in the population.
Efficacy trials determine whether an intervention produces the expected result under ideal circumstances.
1 the quality of being effective; effectiveness:
The drug's efficacy has been questioned by consumer advocates.
The calibration group is not a traditional control group in that no formal comparison of efficacy is made between the experimental and calibration control arms.
The efficacy of an antidementia drug is measured through various outcome assessment scales and psychometric tests.
The tocopherol arm was continued but eventually failed to show efficacy.
Efficacy and tolerability of twice-daily pregabalin for treating pain and related sleep interference in postherpetic neuralgia: a 13-week, randomized trial.
All of these trials were based on evidence of potential efficacy in animal or in vitro models.
Efficacy of high-dose glycine in the treatment of enduring negative symptoms of schizophrenia.
A final efficacy finding of note was the beneficial effect of both ziprasidone and olanzapine on cognitive function.
Optimal vaccine trial design when estimating vaccine efficacy for susceptibility and infectiousness from multiple populations.