Definition Of efficacious


(typically of something inanimate or abstract) successful in producing a desired or intended result; effective.

the vaccine has proved both efficacious and safe

Example Of efficacious

  • A small comparison study demonstrated that these two drugs are equally efficacious .

  • Another edict was issued on December 16, 1074, after a serious drought in north China earlier in the year, requesting the names of deities in shrines and temples known to respond efficaciously to requests for rain.

  • Are you questioning whether these acts have any efficaciousness ?

  • Both drugs were equally efficacious in improving auditory hallucinations and suspiciousness.

  • Clinical trials are in progress and research is ongoing for developing a safe and efficacious vaccine against the disease.

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