efficacy

US /ˈef.ə.kə.si/
UK /ˈef.ə.kə.si/
1.

eficacia

the ability to produce a desired or intended result.

:
•
there is little information on the efficacy of this treatment
:
effectivenesssuccesspotencypowerbenefitadvantagevaluevirtueuseusefulness
:
inefficacy