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 | |