Welcome to your ๐ Substance Use, Opioid Dependence & Addiction Pharmacology Arena โ 40 Integrated MCQs
1.
A 72-year-old man with advanced malignancy and chronic kidney disease is receiving morphine for severe pain. His dose has remained unchanged, but he gradually develops increasing drowsiness and prolonged opioid effects. Which mechanism best explains this change?
2.
A competitive endurance athlete is found to have an abnormally increased red-cell mass after using a performance-enhancing agent. He is counseled that the resulting increase in blood viscosity may predispose him to thrombosis. Which group of abused agents best explains these findings?
3.
A 46-year-old man with long-standing heavy alcohol consumption has increased activity of the microsomal pathway responsible for ethanol oxidation. Which pharmacokinetic adaptation is most likely present?
4.
A patient receives a mixed agonistโantagonist opioid and reports unpleasant dysphoria despite adequate analgesia. Activation of which receptor is most closely associated with this effect?
5.
A patient beginning methadone therapy receives repeated doses over several days. Despite no major increase in the prescribed amount, progressive sedation develops. Which characteristic of methadone provides the best explanation?
6.
During a discussion of endogenous pain-control systems, students are asked to match an endogenous opioid peptide with the receptor for which it has an important preference. Which pairing is most appropriate?
7.
A highly motivated patient with alcohol dependence has completed withdrawal treatment. He requests a medication that will discourage further drinking by producing flushing, nausea, palpitations and hypotension if alcohol is consumed. Which drug best matches this treatment strategy?
8.
A patient with advanced cancer has severe persistent pain that was previously controlled with an oral opioid. Progressive difficulty swallowing now makes the oral route unreliable. Which approach best reflects rational palliative opioid therapy?
9.
A patient has completed detoxification from alcohol but continues to report strong urges to drink because alcohol previously produced a powerful rewarding effect. Which drug would most directly reduce this reinforcement through opioid-receptor blockade?
10.
A man with established opioid dependence becomes excessively sedated after taking an additional opioid dose. Naloxone restores ventilation, but he rapidly develops agitation, sweating, abdominal cramps and vomiting. What best explains this sudden change?
11.
Two men consume the same amount of alcohol over the same period. One drinks after a substantial meal, whereas the other drinks on an empty stomach. The first man develops less rapid intoxication. Which factor best explains this difference?
12.
A university student drinks several alcoholic beverages and subsequently passes urine frequently despite taking little additional fluid. Which action of ethanol most directly contributes to this effect?
13.
A 38-year-old man smoking two packs daily wants pharmacological help to quit. He has a past history of generalized seizures. He prefers a treatment that reduces craving and also makes smoking less rewarding by partially stimulating neuronal nicotinic receptors. Which drug is the best choice?
14.
During investigation of a suspected narcotics-related case, an initial laboratory screening test suggests exposure to a particular drug class. The result may later have evidentiary importance. What is the most appropriate next laboratory principle?
15.
A patient with metastatic cancer has been receiving morphine with satisfactory pain relief. After renal function deteriorates, he develops prolonged sedation and troublesome adverse effects. Which therapeutic principle is most appropriate?
16.
A 42-year-old man has stopped drinking after prolonged alcohol dependence. He has no acute withdrawal symptoms but requires medication to help maintain abstinence by reducing the persistent imbalance between excitatory and inhibitory neurotransmission after chronic alcohol exposure. Which drug is most appropriate?
17.
A patient receiving a psychoactive drug for a prolonged period requires progressively larger amounts for the same effect and develops withdrawal symptoms when it is stopped. He takes the drug exactly as prescribed, shows no compulsive drug-seeking behaviour and continues normal social functioning. Which concept best describes his condition?
18.
A 50-year-old man with prolonged heavy alcohol use abruptly stops drinking. He becomes anxious, tremulous and markedly agitated. Which physiological change best explains the development of this hyperexcitable state?
19.
A patient with opioid dependence is treated with buprenorphine. Increasing the dose eventually produces relatively little additional receptor-mediated effect compared with a full ฮผ agonist. Which pharmacological property best explains this observation?
20.
A 21-year-old student at a party develops marked dissociation, altered perception and impaired coordination after taking a recreational drug. The substance is known to block NMDA receptors. Which drug is most likely responsible?
21.
A poorly nourished man with chronic alcohol dependence is admitted during withdrawal treatment. In addition to controlling withdrawal symptoms, which supportive pharmacological measure is particularly important because prolonged alcohol misuse may be associated with serious neurological complications from deficiency?
22.
A patient who has been receiving parenteral morphine is changed to an oral preparation as his condition improves. The clinician recognizes that the amount reaching the systemic circulation differs between these routes. Which property of morphine is most relevant?
23.
A 23-year-old man who has used cannabis heavily for several years stops using it and develops irritability, poor sleep, reduced appetite and craving. He asks for a specific cessation drug equivalent to varenicline for tobacco dependence. Which management principle is most appropriate?
24.
A deceased person is found with evidence of opioid exposure. Toxicological findings and circumstances support fatal opioid poisoning, while severe suppression of breathing directly led to death. In medico-legal terminology, suppression of breathing represents which component?
25.
A 65-year-old man has abdominal distension, vomiting and absent bowel sounds due to paralytic ileus. He also reports abdominal pain. Why should conventional opioid analgesics be used with particular caution?
26.
A 58-year-old woman receiving palliative care has persistent cancer pain that is well controlled on her regular opioid regimen. She develops brief episodes of markedly increased pain several times during the day. Which management principle is most appropriate?
27.
A boxer uses a drug shortly before weigh-in to achieve rapid weight loss. He later develops dehydration, weakness and an electrolyte disturbance. Which type of performance-enhancing drug misuse best fits this presentation?
28.
A 48-year-old patient taking a monoamine oxidase inhibitor requires analgesia after surgery. Which prescribed analgesic would create the greatest concern for a serious drug interaction?
29.
A man who stopped using cocaine several months ago passes a location where he previously used the drug and suddenly develops intense craving. Which concept best explains why an environmental cue can provoke this response long after acute withdrawal has resolved?
30.
A patient receives codeine for pain but obtains little analgesic benefit despite taking the drug correctly. There is no evidence of malabsorption or renal dysfunction. Which pharmacokinetic difference could best account for the poor response?
31.
During cold weather, an intoxicated man reports feeling unusually warm despite prolonged exposure outdoors. His skin is flushed and warm. Which pharmacological effect of ethanol best explains this finding?
32.
A patient receives morphine for severe postoperative pain. Shortly afterward, he develops facial flushing, generalized itching and a fall in blood pressure without features of airway obstruction. Which pharmacological effect most likely contributed?
33.
A patient undergoing supervised opioid withdrawal develops marked sweating, restlessness, rhinorrhea and autonomic overactivity. An adjunctive non-opioid drug is added to reduce these symptoms. Which pharmacological action best describes this treatment?
34.
A patient has received a full ฮผ-opioid agonist for a prolonged period. Tolerance has developed to much of the sedation and analgesic effect. Which finding may remain relatively prominent because little tolerance develops to it?
35.
A deceased person has a psychoactive drug detected in postmortem toxicology. The laboratory result establishes exposure, but it is unclear whether the death was accidental, suicidal or due to another circumstance. Which additional information is most important before assigning the manner of death?
36.
A 35-year-old woman with a previous seizure disorder is prescribed tramadol for moderate pain. Which adverse effect deserves particular consideration when selecting this drug?
37.
A young adult is brought from a dance event with agitation, marked hyperthermia and altered behaviour after taking a recreational substance associated with increased monoamine signalling and disturbances of water and electrolyte balance. Which drug is the most likely cause?
38.
A 30-year-old man with a head injury requires treatment for severe pain. The clinical team is particularly cautious about administering a large dose of a potent opioid. Which concern is most relevant?
39.
A patient has received prescribed opioid therapy for several weeks after major surgery. When the medication is stopped abruptly, he develops sweating, restlessness and abdominal cramps. There is no history of craving, loss of control or compulsive drug-seeking behaviour. Which interpretation is most appropriate?
40.
During anesthesia, a patient receives fentanyl and develops analgesia rapidly after intravenous administration. Which property contributes most to its rapid entry into the central nervous system?
