薬が効く

くすりがきく

to have medicine be effective

Also written 薬がきく、クスリが効く

Meaning

expv5k
to have medicine be effective

Example sentences

運よく薬が効くとき１時過ぎに寝れるけど、薬を飲まないと４時ぐらいまで眠れない。

If I'm lucky enough for the medicine to work I can get to sleep after 1am but if I don't take it then I can't sleep until about 4am.