She refuses painkilling drugs?

她拒绝使用止痛药吗？

I'd like some painkilling drugs.

我想买点止痛药。

Painkilling drugs were not enough to relieve her suffering.

止痛药不能缓解她的痛苦。

The effect of the painkilling drug didn't wear off for several hours.

止痛药的药效好几个锺头之仍未消失。

This tiny capsule contains two types of effective painkilling ingredients.

这粒小胶囊含有两种有效的止痛成分。