| Central nervous system depression | | Anticholinergics | | Antihistamines | | Belladonna alkaloids | | Phenothiazines | | Antidepressants | | Cyclic antidepressants | | Selective serotonin reuptake inhibitors | | Monoamine oxidase inhibitors | | Antipsychotics | | Simple asphyxiants | | Carbon dioxide | | Inert gases | | Cellular asphyxiants | | Carbon monoxide | | Cyanide | | Hydrogen sulfide | | Methemoglobinemia | | Lithium | | Cholinergics | | Organophosphates | | Carbamates | | Sympatholytics | | Beta blockers | | Sedative-hypnotics | | Benzodiazepines | | Barbiturates | | Alpha-2 adrenergic agonists (eg clonidine, dexmedetomidine) | | Muscle relaxants | | Hypoglycemic agents | | Heavy metals | | Opiates | | Antiseizure medications | | Mushrooms | | Salicylates | | Gamma-hydroxybutyrate | | Volatile inhalants | | Alcohols | | | Agitation | | Amantadine | | Sympathomimetics | | Amphetamines | | Cocaine | | Caffeine | | Phenylpropanolamine | | Theophylline | | Cathinones | | Anticholinergics | | Antihistamines | | Atropine | | Scopolamine | | Antiparkinson agents | | Antispasmodics | | Muscle relaxants | | Plants containing belladonna alkaloids | | Phenothiazines | | Tricyclic antidepressants | | Salicylates | | Central hallucinogens | | Lysergic acid diethylamide (LSD) | | Phencyclidine | | Mescaline | | Psilocybin | | Ketamine | | Designer amphetamines | | Synthetic cannabinoids | | Drug withdrawal states | | Lithium | | Carbon monoxide | | Hypoglycemic agents | | Heavy metals | |
