měi zhǒng yào shénme shíhou yòng, shénme shíhou bùnéng yòng, shénme shíhou gāi qù yīyuàn, dōu yào zhīdào

每种药什么时候用、什么时候不能用、什么时候该去医院，都要知道。

You must know when to use each medicine, when not to use it, and when you should go to the hospital.