sedative

/หˆsษ›dษ™tษชv/
noun
  1. 1

    An agent or drug that sedates, having a calming or soothing effect, or inducing sleep.

adjective
  1. 1

    (pharmaceutical effect) Calming, soothing, inducing sleep, tranquilizing

Source: https://en.wiktionary.org/wiki/sedative