Crossword clues for Have efficacy:EFFICACYAbility to workEFFICACYProductivenessEFFICACIOUSHaving a striking effectEFFICACIOUSWorking as desiredAVAILBe efficaciousVAINWithout efficacy.POTENTEfficaciousUPLIFTINGLike an efficacious sermonAVAILHave efficacyCHARLIESBrand X adding 41 marginally efficacious good-time guys (8)NERFReduce the efficacy of, in gaming slangAVAILEfficacyNERFTank the efficacy of, in gamer slangAVAILINGEfficacious