Refers to the amount of a medicine or substance to be taken or administered at one time or over a period.
この薬の用量を守ってください。
Please follow the dosage for this medicine.
用量を間違えると危険です。
It is dangerous to get the dosage wrong.
low dose; low dosage
amount used; quantity consumed; usage
Compound of 用 (use) and 量 (amount), literally 'amount for use'.