PSYCHOACTIVE DRUGS

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Drug Class Examples Mechanisms of Action
Drugs Used to Alter Moods and States of Consciousness
STIMULANTS (produce psychomotor arousal; treat attention deficit disorder)
Sympathomimetics Dextroamphetamine

Methylphenidate

Monoamine (DA & NE) agonist; increase release; block re-uptake
Cholinomimetics Nicotine

Muscarine

ACh agonist (high dose blocks)
Xanthines Caffeine

Theophylline

Block adenosine receptors; GABA antagonist
Convulsants Strychnine Glycine antagonist
DEPRESSANTS (produce sedation; treat pain, anxiety, sleep disorders)
Opioids Morphine, Codeine

Heroin, Methadone

Endogenous opiate agonist
Barbiturates Secobarbital GABA agonist
Barbiturate-like Meprobamate Similar to barbiturates
Organic solvents Alcohol

Ether

Disrupt neuronal membrane; may facilitate GABA
HALLUCINOGENIC (produce distorted perception)
NE-like Mescaline Alter 5HT activity
5HT-like LSD Alter 5HT activity
Other Marijuana

Anti-cholinergics, PCP

Alter 5HT activity
Drugs Used to Treat Psychological Disorders
ANTIPSYCHOTICS (treat schizophrenia; also delirium and dementia)
Phenothiazines Chlorpromazine Block DA receptors
Butyrophenones Haloperidol Block DA receptors
Other Clozapine Block DA receptors
ANTIDEPRESSANTS (treat depression and bipolar disorder)
Tricyclics( secondary amines)

Tricyclics (tertiary amines)

Nortriptyline

Imipramine

Clomipramine

Block NE re-uptake

Block 5HT re-uptake

Block 5HT re-uptake

Heterocyclics Fluoxetine Block NE & 5HT reuptake
MAO inhibitors Phenelzine

Tranylcypromine

Inhibit monoamine oxidase
Lithium Lithium Stabilizes synapses
ANTI-ANXIETY (treat acute and chronic anxiety; also sleep disturbances)
Benzodiazepines Alprazolam

Diazepam

Faclitate GABA
Other Buspirone Decrease 5HT activity
Notes:

ACh = acetylcholine

DA = dopamine

5HT = serotonin

GABA = gamma amino butyric acid

LSD = lysergic acid diethylamide

MAO = monoamine oxidase

NE = norepinephrine

PCP = phencyclidine