yào pǐn bāo zhuāng pò sǔn、fēng kǒu dǎ kāi、biāo qiān bù qīng huò shuō míng shū quē shī shí，zuì hǎo bú yào mǎi

药品包装破损、封口打开、标签不清或说明书缺失时，最好不要买。

It's best not to buy if the packaging is damaged, the seal is opened, the label is unclear, or the instructions are missing.