Alcohol and Drug Counselor Pharmacology of Psychoactive Substances Flashcards
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A client who has been taking high doses of alprazolam (Xanax) for several months without a prescription expresses a desire to quit 'cold turkey.' What is the most significant life-threatening risk associated with abrupt cessation of this substance?
Answer: Seizures and delirium
Alprazolam is a benzodiazepine, which is a central nervous system depressant. Abrupt cessation after prolonged use can lead to a severe and potentially fatal withdrawal syndrome, similar to alcohol withdrawal. The most dangerous complications are seizures and delirium.
Opioids, such as heroin and fentanyl, primarily produce their analgesic and euphoric effects by binding to and activating which type of neurotransmitter receptors in the brain?
Answer: Mu-opioid receptors
Opioids exert their main effects, including pain relief (analgesia) and euphoria, by acting as agonists at mu-opioid receptors (MORs) located in the brain and other parts of the nervous system.
Which of the following statements BEST explains the clinical significance of a drug's half-life for an alcohol and drug counselor?
Answer: It helps predict the duration and intensity of withdrawal symptoms.
A drug's half-life is the time it takes for the concentration of the drug in the body to be reduced by half. This is clinically significant because it helps predict the timeline for withdrawal. Drugs with a shorter half-life (e.g., alprazolam, cocaine) tend to produce a more rapid and intense withdrawal, while drugs with a longer half-life (e.g., diazepam, methadone) have a more prolonged but typically less acute withdrawal syndrome.
A client receiving medication-assisted treatment (MAT) for opioid use disorder is prescribed buprenorphine. The client is confused about how it works. The counselor should explain that buprenorphine is a partial opioid agonist, which means it:
Answer: activates opioid receptors to a lesser degree than full agonists, reducing cravings and withdrawal without producing strong euphoria.
Buprenorphine is a partial agonist at the mu-opioid receptor. It binds to the receptor and activates it, but to a much lesser degree than full agonists like heroin or methadone. This action is sufficient to alleviate withdrawal symptoms and cravings but has a 'ceiling effect,' which lowers the risk of euphoria and respiratory depression.
The phenomenon where chronic use of a drug in one classification, such as alcohol, leads to a reduced response to another drug in the same classification, such as a benzodiazepine, is known as:
Answer: Cross-tolerance
Cross-tolerance occurs when tolerance to the effects of a certain drug produces tolerance to another drug. This often happens between drugs with similar functions or mechanisms of action, such as alcohol and benzodiazepines, which are both central nervous system depressants that act on GABA receptors.
Which of the following routes of administration delivers a psychoactive substance to the brain most rapidly, thereby increasing its reinforcement potential and risk for addiction?
Answer: Intravenous (IV) injection
Intravenous (IV) injection and inhalation (smoking) are the fastest routes of administration because they deliver the drug directly and quickly into the bloodstream, bypassing the digestive system and reaching the brain in seconds. This rapid onset of intense effects is highly reinforcing and contributes to a greater potential for addiction.