noun
injectable drug; injectable medicine; injection
Pharmacological term for a drug or medicine administered by injection. Can refer to the substance itself or the prepared dosage form.
この注射薬は冷蔵保存が必要です。
This injectable medicine must be stored in a refrigerator.
医師は新しい注射薬を処方
The doctor prescribed a new injectable drug.
内服薬 is an oral medicine taken by mouth, contrasting with 注射薬 which is administered via injection.
Compound of 注射 (injection) + 薬 (drug, medicine).