noun
drug overdose
Medical and general term for taking an excessive amount of a drug, whether accidental or intentional.
過量服用で救急搬送された。
He was rushed to the hospital for a drug overdose.
市販薬でも過量服用は危険です。
Even over-the-counter drugs can be dangerous if taken in overdose.
Compound of 過量 (excessive amount) and 服用 (taking medicine). The term is a straightforward Sino-Japanese medical expression.