薬くすりが効きく

expression, godan verb (-ku)

medicine is effective; medicine works

Used when a medicine or treatment produces the desired effect. Often appears in the negative form 薬が効かない (the medicine doesn't work).

• この薬くすりが効きいて、熱ねつが下さがった。

  This medicine worked and my fever went down.

• 痛いたみ止どめを飲のんだけど、まだ薬くすりが効きかない。

  I took a painkiller, but the medicine still hasn't taken effect.