Definitions of depressant

n a drug that reduces excitability and calms a person

downer, sedative, sedative drug
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chloral hydrate
a colorless crystalline drug used as a sedative; irritates the stomach and can be addictive
Doriden, glutethimide
sedative (trade name Doriden) used to treat some sleep disorders
sedative-hypnotic, sedative-hypnotic drug
a sedative that depresses activity of the central nervous system and reduces anxiety and induces sleep
organic compound having powerful soporific effect; overdose can be fatal
Placidyl, ethchlorvynol
a mild sedative-hypnotic drug (trade name Placidyl)
knockout drops
chloral hydrate in combination with alcohol; usually administered surreptitiously to make the drinker unconscious
Quaalude, methaqualone
sedative-hypnotic drug (trade name Quaalude) that is a drug of abuse
a sedative and hypnotic drug; withdrawn from sale after discovered to cause severe birth defects because it inhibits angiogenesis
antianxiety agent, ataractic, ataractic agent, ataractic drug, tranquilizer, tranquilliser, tranquillizer
a drug used to reduce stress or tension without reducing mental clarity
Type of:
drug of abuse, street drug
a drug that is taken for nonmedicinal reasons (usually for mind-altering effects); drug abuse can lead to physical and mental damage and (with some substances) dependence and addiction
medicament, medication, medicinal drug, medicine
(medicine) something that treats or prevents or alleviates the symptoms of disease

adj capable of depressing physiological or psychological activity or response by a chemical agent

ataractic, ataraxic, sedative, tranquilising, tranquilizing, tranquillising, tranquillizing
tending to soothe or tranquilize
narcotic, narcotising, narcotizing
inducing stupor or narcosis
tending to relax or relieve muscular or nervous tension
hypnagogic, hypnogogic, somniferous, somnific, soporiferous, soporific
sleep inducing
capable of arousing or accelerating physiological or psychological activity or response by a chemical agent
rousing or quickening activity or the senses
adrenocorticotrophic, adrenocorticotropic
stimulating or acting on the adrenal cortex
stimulating the central nervous system
excitant, excitative, excitatory
(of drugs e.g.) able to excite or stimulate
irritating, irritative
(used of physical stimuli) serving to stimulate or excite
stimulant, stimulating
that stimulates
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