over-the-counter drug; OTC medicine
Refers to medicine bought directly at a pharmacy without a prescription. Often contrasted with 売薬 (ばいやく), which can also mean OTC drugs but from the seller's perspective.
See also: 売薬
When I have a cold, I first see how it goes with over-the-counter medicine.
For these symptoms, an OTC drug should be enough.
Standard kanji spelling; the okurigana makes the reading clear.
Abbreviated kanji form; less common but still used.
Compound of 買い (kai, 'buying') + 薬 (kusuri, 'medicine'). The reading ぐすり is a rendaku form of くすり.