Chemical Dependency Counselor License Pharmacology of Substance Use Questions and Answers

Question 1

A client with alcohol use disorder is prescribed disulfiram. The counselor should educate the client that if they consume alcohol, they will likely experience a highly unpleasant reaction. What is the pharmacological mechanism responsible for this effect?

Accepted Answer

It inhibits the enzyme aldehyde dehydrogenase, causing a toxic buildup of acetaldehyde.

Answer

Disulfiram works by irreversibly inhibiting aldehyde dehydrogenase, a key enzyme in the metabolism of alcohol. This blockage leads to the accumulation of acetaldehyde, a toxic byproduct, when alcohol is consumed. The resulting high levels of acetaldehyde cause a severe and unpleasant reaction, including nausea, vomiting, flushing, and palpitations, which serves as a deterrent to drinking.

Question 2

A client is being treated for opioid use disorder with buprenorphine. Which of the following statements BEST describes the primary action of this medication?

Accepted Answer

It is a partial opioid agonist that binds to opioid receptors but produces a less potent effect and has a 'ceiling effect'.

Answer

Buprenorphine is a partial opioid agonist. This means it binds to and activates mu-opioid receptors but to a lesser degree than full agonists like methadone or heroin. This partial activation is sufficient to reduce withdrawal symptoms and cravings but has a 'ceiling effect,' meaning its opioid effects plateau at higher doses, which reduces the risk of respiratory depression and overdose compared to full agonists.

Question 3

Naltrexone is an FDA-approved medication for both alcohol use disorder and opioid use disorder. Its mechanism of action involves:

Accepted Answer

Blocking the euphoric and reinforcing effects of the substance at the opioid receptor.

Answer

Naltrexone is an opioid receptor antagonist. It works by binding to opioid receptors and blocking them. This action prevents opioids like heroin from binding to the receptors, thereby blocking their euphoric effects. In alcohol use disorder, it is thought to reduce the reinforcing, pleasurable effects of alcohol, which are partially mediated by the endogenous opioid system, thus reducing cravings and the desire to drink.

Question 4

A client who has been taking high doses of a short-acting benzodiazepine for several months decides to stop abruptly. The counselor should be aware that the client is at significant risk for which of the following?

Accepted Answer

A severe withdrawal syndrome that can include seizures.

Answer

Abrupt cessation of benzodiazepines, especially short-acting ones taken at high doses, can induce a severe and potentially life-threatening withdrawal syndrome. Symptoms can include intense anxiety, tremors, perceptual disturbances, and, most critically, seizures. Medical supervision and a gradual tapering schedule are essential for safety.

Question 5

Which of the following best explains how stimulant drugs like cocaine and amphetamines produce their intensely reinforcing and euphoric effects?

Accepted Answer

They block the reuptake of dopamine in the brain's reward pathways, leading to a surplus of dopamine.

Answer

The primary mechanism of action for stimulants like cocaine and amphetamines is their effect on the dopamine system. They block the dopamine transporter, which is responsible for removing dopamine from the synapse. This blockage results in a significant increase in the concentration and duration of dopamine in the brain's reward circuits (like the nucleus accumbens), causing intense feelings of pleasure and euphoria.

Chemical Dependency Counselor License Exam Practice Test

Chemical Dependency Counselor License Exam Practice Test

Chemical Dependency Counselor License Pharmacology of Substance Use Questions and Answers