opiate

noun
  1. 1

    A drug, hormone or other substance derived from or related to opium.

  2. 2

    Something that dulls the senses and induces a false and unrealistic sense of contentment.

verb
  1. 1

    To treat with an opiate drug.

adjective
  1. 1

    Relating to, resembling, or containing opium.

  2. 2

    (pharmaceutical effect) Soporific; inducing sleep or sedation.

  3. 3

    Deadening; causing apathy or dullness.

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