ataractic

Adjective

• tending to soothe or tranquilize
  • valium has a tranquilizing effect
    
  • took a hot drink with sedative properties before going to bed
    

Noun

• a drug used to reduce stress or tension without reducing mental clarity

Related words

• Synonyms: 
  ataraxic , sedative , tranquilizing , tranquillizing , tranquilising , tranquillising , tranquilizer , tranquillizer , tranquilliser , antianxiety agent , ataractic drug , ataractic agent