noun
Refers to medication that relieves pain. The glosses 'sedative', 'tranquilizer', and 'anodyne' are less common or broader; the core meaning is pain relief.
歯が痛いので鎮痛剤を飲んだ。
I took a painkiller because my tooth hurt.
この鎮痛剤は
This analgesic works well for headaches.