Any type of numbing or soothing 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.
Of, or relating to narcotics.
Inducing sleep; causing narcosis.
A drug used to reduce anxiety or tension.
That which tranquillizes or soothes.