noun
Refers to non-prescription medicines available at pharmacies and drugstores.
風邪薬はＯＴＣ薬として買えます。
Cold medicine can be bought as an over-the-counter drug.
このＯＴＣ薬は副作用が少ない。
This over-the-counter drug has few side effects.
一般用医薬品 is the formal Japanese term for OTC drugs, used in official contexts.
From English 'OTC' (over-the-counter) + 薬 (medicine).