Chemical Dependency Counselor License Exam Pharmacology of Substance Use 5 — Questions and Answers
Question 1: A client reports using kratom daily to manage opioid cravings without a prescription. The counselor should know that kratom's active alkaloids (mitragynine, 7-HMG) primarily act on:
- Cannabinoid CB1 receptors
- Mu and delta opioid receptors (Correct answer)
- Alpha-2 adrenergic receptors
- Serotonin 5-HT1A receptors
Correct answer: Mu and delta opioid receptors
Kratom alkaloids are partial mu-opioid agonists and have opioid-like analgesic and euphoric effects, carrying dependence and withdrawal risks similar to traditional opioids.
Question 2: The 'kindling' phenomenon in repeated alcohol withdrawal refers to:
- Tolerance developing so that more alcohol is needed to achieve intoxication
- Each successive withdrawal episode becoming progressively more severe and seizure-prone (Correct answer)
- Increasing liver sensitivity to acetaldehyde over time
- The gradual onset of alcohol's CNS depressant effects
Correct answer: Each successive withdrawal episode becoming progressively more severe and seizure-prone
Neural sensitization from repeated alcohol withdrawal cycles lowers the seizure threshold with each episode, making clinical management of later withdrawals more medically urgent.
Question 3: Which pharmacological feature of fentanyl makes it especially dangerous in the illicit drug supply?
- Its very long half-life causing prolonged respiratory depression
- Its extreme potency (50–100x morphine) meaning a lethal dose fits in a microscopic amount (Correct answer)
- Its oral bioavailability making it easy to ingest unknowingly
- Its slow onset preventing users from gauging the dose
Correct answer: Its extreme potency (50–100x morphine) meaning a lethal dose fits in a microscopic amount
Fentanyl's potency means a dose measured in micrograms can be lethal; small measurement errors or uneven mixing ('hot spots') in counterfeit pills or heroin cause overdoses even in experienced users.
Question 4: Varenicline (Chantix) reduces tobacco cravings primarily by:
- Releasing large amounts of dopamine to simulate smoking
- Acting as a partial agonist at alpha-4 beta-2 nicotinic acetylcholine receptors (Correct answer)
- Blocking dopamine D2 receptors to reduce reward
- Inhibiting monoamine oxidase to prolong nicotine's effects
Correct answer: Acting as a partial agonist at alpha-4 beta-2 nicotinic acetylcholine receptors
As a partial agonist, varenicline provides enough receptor stimulation to reduce cravings and withdrawal while blocking full nicotine binding and blunting the reinforcement from smoking.
Question 5: Protracted abstinence syndrome following cessation of heavy alcohol use is best characterized by:
- Acute delirium tremens lasting weeks to months
- Persistent anxiety, dysphoria, insomnia, and craving lasting months after acute withdrawal resolves (Correct answer)
- A rebound hyperalgesia to pain stimuli lasting 48–72 hours
- Hypersomnolence and increased appetite for the first two weeks
Correct answer: Persistent anxiety, dysphoria, insomnia, and craving lasting months after acute withdrawal resolves
Neuroadaptive changes from chronic alcohol use take months to normalize; the resulting subclinical dysregulation of GABA, glutamate, and dopamine systems sustains craving and relapse vulnerability.
Question 6: A client in opioid withdrawal is given clonidine. Its mechanism of action in this context is:
- Partial opioid agonism at mu receptors to substitute for opioids
- Alpha-2 adrenergic agonism that reduces noradrenergic hyperactivity from the locus coeruleus (Correct answer)
- Blocking opioid receptors so withdrawal resolves faster
- GABA-B agonism to reduce autonomic instability
Correct answer: Alpha-2 adrenergic agonism that reduces noradrenergic hyperactivity from the locus coeruleus
During opioid withdrawal, the locus coeruleus becomes hyperactive; clonidine stimulates presynaptic alpha-2 receptors there, suppressing norepinephrine release and relieving sympathetic symptoms (sweating, anxiety, GI distress).
Question 7: Which route of drug administration produces the fastest onset of action and the highest peak plasma concentration?
- Sublingual
- Intramuscular
- Intravenous (Correct answer)
- Transdermal
Correct answer: Intravenous
Intravenous injection delivers 100% of the dose directly into systemic circulation with no absorption barrier, producing peak brain concentrations within seconds and maximizing reinforcing potential.
