CDCA Pharmacology of Substances & Drug Effects 1 — Questions and Answers
Question 1: Which neurotransmitter is most directly associated with the rewarding effects of alcohol and opioids in the brain's reward pathway?
- Serotonin
- Dopamine (Correct answer)
- GABA
- Norepinephrine
Correct answer: Dopamine
Dopamine released in the nucleus accumbens (mesolimbic pathway) is the primary neurotransmitter responsible for the reinforcing/rewarding effects of alcohol and opioids.
Question 2: A client reports feeling euphoric, slowed breathing, and pinpoint pupils after using heroin. These effects are consistent with which drug classification?
- CNS stimulants
- Hallucinogens
- CNS depressants/opioids (Correct answer)
- Cannabis
Correct answer: CNS depressants/opioids
Pinpoint pupils (miosis), euphoria, and respiratory depression are classic signs of opioid intoxication, which is a CNS depressant drug class.
Question 3: Which of the following is a long-acting opioid agonist used in medication-assisted treatment (MAT) for opioid use disorder that requires daily clinic dispensing initially?
- Naltrexone
- Buprenorphine
- Methadone (Correct answer)
- Naloxone
Correct answer: Methadone
Methadone is a long-acting full opioid agonist used in MAT that must be dispensed daily through licensed opioid treatment programs (OTPs) at the start of treatment.
Question 4: What is the primary pharmacological mechanism of alcohol (ethanol) in the brain?
- Blocking dopamine reuptake
- Enhancing GABA and inhibiting NMDA glutamate receptors (Correct answer)
- Stimulating acetylcholine release
- Blocking serotonin receptors
Correct answer: Enhancing GABA and inhibiting NMDA glutamate receptors
Alcohol enhances inhibitory GABA activity and inhibits excitatory NMDA glutamate receptors, producing CNS depressant effects.
Question 5: A client who abruptly stops using benzodiazepines after prolonged heavy use is at greatest risk for which withdrawal complication?
- Hypertension and muscle cramps only
- Life-threatening seizures and delirium tremens (Correct answer)
- Excessive sleepiness with no serious risk
- Mild anxiety that resolves within 24 hours
Correct answer: Life-threatening seizures and delirium tremens
Benzodiazepine withdrawal (like alcohol withdrawal) can cause life-threatening seizures and delirium tremens due to rebound CNS excitability, requiring medical supervision.
Question 6: Methamphetamine primarily produces its effects by:
- Activating opioid receptors in the brainstem
- Massively increasing dopamine, norepinephrine, and serotonin release while blocking reuptake (Correct answer)
- Enhancing GABA inhibition throughout the CNS
- Binding to cannabinoid receptors in the limbic system
Correct answer: Massively increasing dopamine, norepinephrine, and serotonin release while blocking reuptake
Methamphetamine causes a massive surge of dopamine, norepinephrine, and serotonin by promoting release and blocking reuptake, leading to intense stimulant effects.
Question 7: Naloxone (Narcan) is used in opioid overdose reversal because it acts as a(n):
- Opioid agonist that slows breathing
- Competitive opioid receptor antagonist (Correct answer)
- GABA receptor enhancer
- Dopamine reuptake inhibitor
Correct answer: Competitive opioid receptor antagonist
Naloxone is a competitive opioid receptor antagonist that rapidly displaces opioids from receptors, reversing life-threatening respiratory depression.
CDCA Pharmacology of Substances & Drug Effects 1
Which neurotransmitter is most directly associated with the rewarding effects of alcohol and opioids in the brain's reward pathway?