Zhè zhǒng yào de yàoxiào hěn kuài.
This medicine takes effect very quickly.
Yàoxiào yǐjīng guò le, xūyào zài chī yī piàn.
The medicine has worn off — you need to take another tablet.
Zhè ge yào de yàoxiào néng chíxù duōjiǔ?
How long does this medicine's effect last?
