MCAP Pharmacology and Medication-Assisted Treatment 2 — Questions and Answers
Question 1: Disulfiram (Antabuse) produces an aversive reaction to alcohol through which primary mechanism?
- Blocking dopamine reuptake in the nucleus accumbens
- Inhibiting aldehyde dehydrogenase, causing toxic acetaldehyde accumulation (Correct answer)
- Antagonizing GABA receptors to counteract alcohol's sedation
- Enhancing glutamate activity to oppose alcohol's depressant effects
Correct answer: Inhibiting aldehyde dehydrogenase, causing toxic acetaldehyde accumulation
Disulfiram inhibits aldehyde dehydrogenase, the enzyme that metabolizes acetaldehyde, causing this toxic metabolite to accumulate and produce flushing, nausea, and cardiovascular distress.
Question 2: Acamprosate (Campral) is believed to reduce alcohol cravings in early recovery by:
- Blocking mu-opioid receptors to reduce alcohol's rewarding effects
- Inhibiting aldehyde dehydrogenase to create an aversive reaction to alcohol
- Modulating glutamate and GABA activity to restore neurochemical balance disrupted by chronic alcohol use (Correct answer)
- Increasing serotonin release to elevate mood and reduce cravings
Correct answer: Modulating glutamate and GABA activity to restore neurochemical balance disrupted by chronic alcohol use
Acamprosate restores the balance between inhibitory GABA and excitatory glutamate neurotransmission disrupted by chronic alcohol use, reducing protracted withdrawal symptoms and cravings.
Question 3: When managing severe alcohol withdrawal syndrome with a history of seizures, the evidence-based first-line pharmacological treatment is:
- Antipsychotics such as haloperidol
- Beta-blockers such as propranolol
- Benzodiazepines such as diazepam or lorazepam (Correct answer)
- Opioid agonists such as buprenorphine
Correct answer: Benzodiazepines such as diazepam or lorazepam
Benzodiazepines are the gold standard for alcohol withdrawal due to cross-tolerance with alcohol at GABA-A receptors, effectively preventing seizures and delirium tremens.
Question 4: Naltrexone's mechanism of action in treating alcohol use disorder (AUD) involves:
- Creating an aversive physical reaction when alcohol is consumed
- Blocking opioid receptors to reduce the rewarding effects of alcohol (Correct answer)
- Reducing glutamate excitotoxicity associated with alcohol withdrawal
- Increasing dopamine levels to satisfy cravings without alcohol use
Correct answer: Blocking opioid receptors to reduce the rewarding effects of alcohol
Naltrexone blocks opioid receptors, disrupting the opioid-mediated dopamine release that contributes to alcohol's rewarding effects, thereby reducing cravings and relapse.
Question 5: Varenicline (Chantix) is effective for smoking cessation because it:
- Acts as a full agonist at all nicotinic acetylcholine receptors
- Inhibits monoamine oxidase to slow nicotine metabolism and extend its half-life
- Acts as a partial agonist at alpha-4 beta-2 nicotinic receptors, reducing cravings and blocking nicotine's effects (Correct answer)
- Blocks dopamine reuptake to substitute for nicotine's rewarding properties
Correct answer: Acts as a partial agonist at alpha-4 beta-2 nicotinic receptors, reducing cravings and blocking nicotine's effects
Varenicline is a partial agonist at alpha-4 beta-2 nicotinic acetylcholine receptors, providing enough stimulation to reduce withdrawal while blocking nicotine from fully activating these receptors.
Question 6: Which smoking cessation medication carries an FDA black box warning due to reports of serious neuropsychiatric adverse effects, including depression and suicidal ideation?
- Nicotine replacement therapy (transdermal patch)
- Bupropion (Zyban)
- Varenicline (Chantix) (Correct answer)
- Nortriptyline
Correct answer: Varenicline (Chantix)
Varenicline (Chantix) has carried an FDA black box warning for serious neuropsychiatric adverse effects, although subsequent large-scale studies have questioned the magnitude of this risk.
Question 7: A patient with cocaine use disorder asks about medications to reduce cravings. The clinician should accurately inform the patient that:
- Buprenorphine is FDA-approved and highly effective for cocaine use disorder
- Naltrexone completely eliminates cocaine cravings when taken as prescribed
- No FDA-approved medications currently exist specifically for stimulant use disorders (Correct answer)
- Disulfiram is the standard first-line medication for cocaine dependence
Correct answer: No FDA-approved medications currently exist specifically for stimulant use disorders
As of current evidence, no FDA-approved medications exist specifically for stimulant use disorders (cocaine or methamphetamine), though several candidates are under active investigation.
MCAP Pharmacology and Medication-Assisted Treatment 2
Disulfiram (Antabuse) produces an aversive reaction to alcohol through which primary mechanism?