tranquilizer /ˈtræŋkwəlaɪzə/

• 1. 

  N-COUNT A tranquilizer is a drug that makes people feel calmer or less anxious. Tranquilizers are sometimes used to make people or animals become sleepy or unconscious. 镇静剂

  例：

  If a tranquilizer is prescribed, be sure your physician informs you of its possible side effects, such as addiction.

  如果开了镇静剂，一定要让医生告诉你它可能带来的副作用，例如上瘾。