CAADE Pharmacology of Substances 2 — Questions and Answers
Question 1: Which neurotransmitter system is primarily affected by opioids to produce analgesia and euphoria?
- Dopaminergic system
- Endogenous opioid (mu-receptor) system (Correct answer)
- GABAergic system
- Serotonergic system
Correct answer: Endogenous opioid (mu-receptor) system
Opioids bind primarily to mu-opioid receptors, activating the endogenous opioid system to produce analgesia, euphoria, and respiratory depression.
Question 2: A client reports using alcohol daily and wants to stop abruptly. Which withdrawal symptom indicates a medical emergency?
- Mild tremors and sweating
- Insomnia and anxiety
- Tonic-clonic seizures (Correct answer)
- Nausea and headache
Correct answer: Tonic-clonic seizures
Tonic-clonic seizures during alcohol withdrawal are a medical emergency and can be life-threatening if untreated.
Question 3: What pharmacological mechanism explains why benzodiazepines are effective in treating acute alcohol withdrawal?
- They block dopamine reuptake
- They enhance GABA-A receptor activity, substituting for alcohol's CNS depression (Correct answer)
- They inhibit serotonin synthesis
- They block NMDA glutamate receptors directly
Correct answer: They enhance GABA-A receptor activity, substituting for alcohol's CNS depression
Benzodiazepines enhance GABA-A activity, mimicking alcohol's CNS depressant effects and preventing dangerous hyperexcitability during withdrawal.
Question 4: Which property of methamphetamine distinguishes its duration of action from cocaine?
- Methamphetamine has a shorter half-life than cocaine
- Methamphetamine has a longer half-life, producing effects lasting 8-12 hours (Correct answer)
- Both drugs have identical durations of action
- Cocaine lasts longer because it is lipid-soluble
Correct answer: Methamphetamine has a longer half-life, producing effects lasting 8-12 hours
Methamphetamine has a half-life of approximately 10-12 hours, much longer than cocaine's 1-hour half-life, resulting in prolonged stimulant effects.
Question 5: Cannabis produces its psychoactive effects primarily by binding to which receptors?
- Alpha-adrenergic receptors
- CB1 cannabinoid receptors in the brain (Correct answer)
- NMDA glutamate receptors
- Nicotinic acetylcholine receptors
Correct answer: CB1 cannabinoid receptors in the brain
THC binds to CB1 cannabinoid receptors concentrated in the brain's limbic system, basal ganglia, and cerebellum, producing psychoactive effects.
Question 6: Tolerance to opioids develops most rapidly to which effect?
- Constipation
- Pupil constriction (miosis)
- Respiratory depression and euphoria (Correct answer)
- Nausea
Correct answer: Respiratory depression and euphoria
Tolerance to opioid-induced respiratory depression and euphoria develops rapidly, while tolerance to constipation and miosis develops very slowly or not at all.
Question 7: Which term describes the phenomenon where a person needs a substance to function normally, and removal causes physiological disturbance?
- Psychological dependence
- Sensitization
- Physical dependence (Correct answer)
- Tolerance
Correct answer: Physical dependence
Physical dependence is a neuroadaptive state in which abrupt discontinuation of a substance causes a withdrawal syndrome due to physiological changes.
CAADE Pharmacology of Substances 2
Which neurotransmitter system is primarily affected by opioids to produce analgesia and euphoria?