noun
powerful medicine; violent poison
Refers to a drug or substance with extremely strong, often dangerous effects. Can be used for potent pharmaceuticals or toxic substances.
この劇剤は医師の指示なしに使用してはいけない。
This powerful medicine must not be used without a doctor's instructions.
その植物から抽出された劇剤は、わずかな量でも致死性がある。
The violent poison extracted from that plant is lethal even in small amounts.
Compound of 劇 (げき, 'violent, intense') and 剤 (ざい, 'medicine, drug'). The exact historical derivation is uncertain, but the term is used in technical and medical contexts.