a drug or other substance that affects mood or behaviour and is consumed for non-medical purposes, especially one sold illegally

the narcotics were found stashed in their luggage

cultivation of a plant used to make a popular local narcotic

a narcotics trafficking operation

a drug that relieves pain and induces drowsiness, stupor, or insensibility

pethidine, usually given as an injection, is a narcotic which causes drowsiness