Module 22:Drugs

Chapter 9:

States of Consciousness

Psychoactive Drug Dependence• A chemical substance

that alters perceptions, mood, or behavior

• Three common psychoactive drugs:

– Caffeine

– Alcohol

– Nicotine

• Induce an altered state of consciousness

• A state of physiological and/or psychological need to take more of a substance after continued use.– Withdrawal follows

if the drug is discontinued

Withdrawal Tolerance

• The discomfort and distress that follow when a person who is dependent on a drug discontinues the use of the drug– Withdrawal symptoms

are usually the reverse of the drug’s effects.

• Reduced responsiveness to a drug, prompting the user to increase the dosage to achieve effects previously obtained by lower doses of the drug

Tolerance

Drugs and Neurotransmission

Module 22: Drugs

Neurotransmission

• The process whereby neurons communicate with each other– Neurotransmission, especially in the brain

and spinal cord, helps explain the effects of psychoactive drugs.

• Psychoactive drugs interfere with normal neurotransmission.

Neurotransmitters

• Chemical messengers that cross synaptic gaps between neurons– When released by the sending neuron,

neurotransmitters travel across the synapse and bind to receptor sites on the receiving neuron, setting up the next link in the chain of communication.

Synapse

• The junction between the tip of the sending neuron and the receptor sites on the receiving neuron

• Call the synaptic gap or cleft

Neural Neurotransmitters Activity and the Synapse

Reuptake

• Process where the unused neurotransmitter chemical is reabsorbed by the sending neuron– How anti-depressants

work; they facilitate the reuptake

Drug Classifications

Module 22: Drugs

Psychoactive Drugs and Synapses• Psychoactive drugs affect synapses and

neurotransmitters in three ways:– Binding with receptors– Blocking receptor site– Blocking neurotransmitters’ reuptake

Five Psychoactive Drug Categories

• Five different categories we will study:

– #1. Depressants

– #2. Opiates

– #3. Stimulants

– #4. Hallucinogens

– #5. Marijuana

Drug Classifications: #1. Depressants

Module 22: Drugs

#1. Depressants

• Drugs that reduce neural activity and slow body functioning– Includes alcohol and sedatives

Depressants: Alcohol (ethyl alcohol)

• Found in beer, wine, and liquor

• The second most used psychoactive drug (caffeine first)

• Slows thinking, and impairs physical activity

• A measure of how much alcohol is in a person’s bloodstream

• BAC of .08 considered legal intoxication in most states

Affects of AlcoholEuphoric Memory & Sleep

• Alcohol impairs the parts of the brain responsible for controlling inhibitions and making judgments

• Studies have shown that alcohol impairs memory by suppressing the processing of events into long term memory.

• Alcohol impairs REM sleep, further disrupting memory storage.

Do you have an alcohol problem?

Depressants: Sedatives

• Drugs that reduce anxiety or induce sleep– Also called tranquilizers

• Include barbiturates and benzodiazepines

Barbiturates Benzodiazepines • Drugs that depress the

activity of the central nervous system and thereby reduce anxiety– Can be lethal in overdose

and interact with other drugs, especially alcohol

• Impair both memory and judgment

• Can create tolerance and dependence

• Drugs that depress that activity of the central nervous system without most of the side effects associated with barbiturates

• Include Valium and Xanax

• Can create dependency

Drug Classifications: #2. Opiates

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#2. Opiates

• Drugs that depress neural activity, temporarily lesson pain and anxiety

• Include: opium, morphine, and heroin

Opiates: Morphine & Endorphins

• Strong sedative and pain-relieving drug derived from opium

• Works by preventing pain neurons from firing or releasing pain-signaling neurotransmitters into the synapse

• Natural, opiate-like neurotransmitters linked to pain control and to pleasure

• Body’s natural pain killers

Drug Classifications: #3. Stimulants

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#3. Stimulants

• Drugs that excite neural activity and speed up body functions

• Include: caffeine, nicotine, amphetamines, and cocaine

Caffeine Nicotine• Stimulant found in

coffee, chocolate, tea, and some soft drinks

• Provides user with a sense of increased energy, mental alertness, and forced wakefulness

• Blocks neurological receptor sites that , if activated, sedate the central nervous system

• Stimulant found in tobacco

• Effects similar to those of caffeine

• Very addictive and does not stay in the body very long– Explains constant

cravings

Cocaine Amphetamines• Stimulant derived from

leaves of the coca plant– Crack – cocaine crystals

• Blocks the reuptake of certain neurotransmitters

• Dependency is quick and severe; places extreme strain on cardiovascular system

• Drugs that stimulate neural activity, speeding up body functions, with associated energy and mood changes

• Includes: speed, uppers, and methamphetamines

• Mimic adrenaline• Can cause irreversible

changes in mood

Drug Classifications: #4. Hallucinogens

Module 22: Drugs

#4. Hallucinogens

• Drugs that distort perceptions and evoke sensory images in the absence of sensory input

• Include: LSD and ecstasy

• Sometimes called “psychedelics”

Lysergic Acid Ecstacy Diethylamide (LSD)

• Powerful hallucinogenic drug

• Also known as “acid”• The effects vary from

person to person• Users can be dangerous

to themselves and others.

• Hallucinogenic drug that produces lower inhibitions, pleasant feelings, and greater acceptance of others

• Also called MDMA• Even moderate users

may experience permanent brain damage.

Drug Classifications: #5: Marijuana

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#5. Marijuana

• Leaves, stems, resin, and flowers form the hemp plant that, when smoked, lower inhibitions and produce feelings of relaxation and mild euphoria

• THC (delta-9-tetrahydrocannabinol) is the active ingredient

• Disrupts memory; lung damage from smoke

Prevention

Module 22: Drugs

High School Drug Use(Johnston & others, 2002)

High School Drug Use

High School Drug Use

High School Drug Use