Correct

下药

/ xiàyào / 
Strokes

Definition

to prescribe medicine/to poison/to slip a drug (into sb's drink etc)

Example

As a Verb

prescribe medicines

1
Yīn
因
bìng
病
xiàyào
下药

suit the medicine to the illness

2
Duìzhèngxiàyào
对症下药

prescribe the right remedy for an illness

3
Xiàyào
下药
qīng
轻

prescribe low/small doses

4
Xiàyào
下药
chóng
重

prescribe heavy/strong/high doses

As a Verb

put poison in; poison

5
Gěi
给
zhǒngzi
种子
xiàyào
下药

poison the seeds

6
Gěi
给
kāfēi
咖啡
xiàyào
下药

poison sb's coffee