用药不当会引起严重的不良反应。

The improper use of medicine could lead to severe adverse reactions.

《柯林斯英汉双解大词典》

是指病后用药不当而引起的疾病复发。

Disease recrudescence which after the medicine duplicate is refers to gets sick, applies drugs improper causes.

youdao

有的人可能只在药店里买了几剂药。我认为，主要问题是用药较早和用药不当。

I ascribe most of the problem to early adoption and inappropriate use.

youdao