depressant

nouns

a drug that reduces excitability and calms a person
depressant, downer, sedative, sedative drug
is derived from
depress

adjectives

capable of depressing physiological or psychological activity or response by a chemical agent
depressant
is derived from
depress
antonym
stimulative
is similar to
tending to soothe or tranquilize
"valium has a tranquilizing effect"; "took a hot drink with sedative properties before going to bed"
ataractic, ataraxic, sedative, tranquilising, tranquilizing, tranquillising, tranquillizing
is similar to
inducing stupor or narcosis
"narcotic drugs"
narcotic, narcotising, narcotizing
is similar to
tending to relax or relieve muscular or nervous tension
"a relaxant drug"
relaxant
is similar to
sleep inducing
hypnagogic, hypnogogic, somniferous, somnific, soporiferous, soporific