Translation guide
The drug heroin. In Japanese, it is most commonly referred to as ヘロイン, a direct loanword from English. Other terms exist but are less common or technical.
Referring to the illegal opioid drug
The standard Japanese word for heroin, borrowed from English. Used in news, medical contexts, and everyday speech.
He died of heroin addiction.
The chemical name for heroin (diacetylmorphine). Used in scientific or pharmacological contexts.
Heroin is chemically called diacetylmorphine.
The police seized a large amount of heroin.