work, be effective
この薬はよく効きますよ。
This medicine works really well.
その薬はすぐに効きますか。
Does that medicine take effect quickly?
痛みを和らげるには何が効きますか?
What works to relieve the pain?
ここの水は効きますよ
The water here is really therapeutic.
— 8 1/2 (1963)
このお薬は効きますか?
Does this medicine work?
この薬は風邪に効きます。
This medicine is effective against colds.
この薬は傷によく効きます
This medicine works well on wounds.
— レッドクリフ Part I (2008)
この薬は本当に効きますか?
Does this medicine really work?