Lydgate, inclined to be sarcastic on the superstitious faith of the people in the efficacy of "the bill," while nobody cared about the low state of pathology, sometimes assailed Will with troublesome questions.
But it is given to us sometimes even in our every-day life to witness the saving influence of a noble nature, the divine efficacy of rescue that may lie in a self-subduing act of fellowship.
There are no more uses of "efficacy" in the book.
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The doctor weighed the efficacy of each treatment against potential side-effects.
They held hearings to investigate concerns about the safety and efficacy of the vaccine.