sedative
1. [ adjective ] tending to soothe or tranquilize
Synonyms: ataraxic tranquilizing ataractic
Examples:

"valium has a tranquilizing effect" "took a hot drink with sedative properties before going to bed"

Related terms: depressant
2. [ adjective ] tending to soothe or tranquilize
Synonyms: ataraxic tranquilising tranquilizing ataractic
Examples:

"valium has a tranquilizing effect" "took a hot drink with sedative properties before going to bed"

Related terms: depressant
3. [ noun ] (medicine,pharmacology) a drug that reduces excitability and calms a person
Synonyms: depressant downer sedative_drug
Related terms: medicine drug_of_abuse bromide doriden chloral_hydrate sedative-hypnotic benzodiazepine