medicine，drug，chemicals；

[例句] 我们服的药相对来说药性温和，但是我们却在把它们变成毒药。 We're taking relatively benign medicines and we're turning them into poisons.

[例句] 如果突然停服这些药，则可能出现一些戒断症状。 If these drugs are stopped abruptly then some withdrawal symptoms may occur.