Zhèzhǒng yào de yàoxiào hěnkuài.
This medicine takes effect very quickly.
Yàoxiào yǐjīng guò le, xūyào zài chī yīpiàn.
The medicine has worn off — you need to take another tablet.
Zhège yào de yàoxiào néng chíxù duōjiǔ?
How long does this medicine's effect last?
