medicinal effect, effect of a medicine
你别问药效怎么样
Don't ask me how well the medicine works.
— Dying to Survive (2018)
我看不出要怎样才知道药效发作
I can't tell how to know when the medicine starts to take effect.
— 几近成名 (2000)
药效怎么样
How effective is the medicine?
药效是一样的
They have the same effect.