intended to give comfort

comforting

(of a person) with thoughts far away from her or his surroundings or work

illusory, romantic

(of) a drug which produces sleep or reduces pain and is dangerous if taken in large quantities; (of) a person addicted to narcotics

dulling, painkilling

(a medicine, drug) used to calm the nerves and reduce stress

soothing

(a substance, drink etc) producing sleep

sleepy; sleep-inducing