narcotic

[1]	drug , soporific , stuporific , hypnotic , sedative , opiate , anaesthetic , stupefacient , tranquillizer

adj.

[1]	soporific , stuporific , hypnotic , sedative , somnolent , sleep-inducing , opiate , dulling , numbing , anaesthetic , stupefacient , stupefying , stupefactive , tranquillizing , Lethean
[2]	narcotizing , narcotising
[3]	soporiferous , soporific