noun
Medical term for the amount of a drug to be administered at one time or over a period.
医師は患者の体重に基づいて投薬量を調整した。
The doctor adjusted the dosage based on the patient's weight.
この薬の適切な投薬量は1日2回です。
The appropriate dose of this medicine is twice a day.
服用量 refers to the amount of medicine taken orally by a patient, while 投薬量 can include any route of administration (e.g., injection) and is often used from the prescriber's perspective.
Compound of 投薬 (とうやく, 'administration of medicine') + 量 (りょう, 'amount').