noun
household medicine; medicine kept at home
Refers to medicines routinely kept at home for common ailments, such as cold medicine or stomach medicine.
我が家の常備薬は、風邪薬と胃薬です。
Our household medicines are cold medicine and stomach medicine.
Compound of 常備 (じょうび, 'always kept on hand') + 薬 (やく, 'medicine').