noun
oral medicine; oral medication
Medical term for drugs taken by mouth, as opposed to injections or topical applications.
この経口薬は食後に服用してください。
Please take this oral medication after meals.
内服薬 is a more common term for oral medicine in everyday medical contexts, while 経口薬 is more technical and often used in pharmaceutical or clinical settings.
Compound of 経口 (けいこう, 'oral', literally 'via the mouth') and 薬 (やく, 'medicine').