narcotic
adj//nɑː(ɹ)ˈkɒtɪk//narkotisk, narkotika, knark
Of, or relating to narcotics.
(pharmaceutical effect) Inducing sleep; causing narcosis.
(pharmaceutical drug) Any substance or drug that reduces pain, induces sleep and may alter mood or behaviour; in some contexts, especially in reference to the opiates-and-opioids class, especially in reference to illegal drugs, and often both.
Any type of numbing or soothing drug.