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Comprehensive Opioid Pharmacology
And Pain Management Assessment
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
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Question 1 What is the primary mechanism of action of morphine in pain relief? A. Blocking sodium channels in peripheral nerves B. Binding to mu-opioid receptors in the central nervous system C. Inhibiting cyclooxygenase enzymes D. Blocking dopamine receptors Rationale: Morphine produces analgesia primarily by binding to mu-opioid receptors in the brain and spinal cord. This leads to inhibition of neurotransmitter release (such as substance P), decreased neuronal excitability, and reduced pain perception. It does not act via sodium channel blockade (local anesthetics), COX inhibition (NSAIDs), or dopamine receptor blockade (antipsychotics). Question 2 Which opioid is considered a full agonist? A. Buprenorphine B. Nalbuphine
C. Pentazocine D. Fentanyl Rationale: Fentanyl is a full mu-opioid receptor agonist, producing maximal analgesic effect. Buprenorphine is a partial agonist, while nalbuphine and pentazocine are mixed agonist-antagonists. Full agonists produce dose-dependent analgesia but also carry higher risks of respiratory depression. Question 3 The most serious acute adverse effect of opioid overdose is: A. Constipation B. Miosis C. Respiratory depression D. Urinary retention Rationale: Respiratory depression is the leading cause of death in opioid overdose due to suppression of the brainstem respiratory centers. While miosis, constipation, and urinary retention are common, they are not life-threatening. Question 4 Which drug is used as an opioid antagonist in overdose? A. Methadone B. Buprenorphine C. Naloxone D. Tramadol Rationale: Naloxone is a competitive opioid receptor antagonist that rapidly reverses
A. Morphine B. Fentanyl C. Methadone D. Meperidine Rationale: Methadone is a long-acting full opioid agonist used in maintenance therapy because it prevents withdrawal symptoms and reduces cravings due to its long half-life. Question 8 A major risk of long-term opioid therapy is: A. Hypertension B. Hypoglycemia C. Tolerance and physical dependence D. Hyperactivity Rationale: Chronic opioid use leads to tolerance (requiring higher doses for same effect) and physical dependence (withdrawal symptoms if stopped). These are expected pharmacologic adaptations. Question 9 Which opioid is safest in patients with renal failure? A. Morphine B. Codeine C. Meperidine D. Fentanyl
Rationale: Fentanyl has no active metabolites that accumulate in renal failure, making it safer compared to morphine and meperidine, which produce toxic metabolites. Question 10 Which sign is most characteristic of opioid toxicity? A. Mydriasis B. Pinpoint pupils (miosis) C. Hyperreflexia D. Tachycardia Rationale: Opioid toxicity typically presents with the triad of CNS depression, respiratory depression, and pinpoint pupils due to parasympathetic stimulation. Question 11 Which opioid has both analgesic and antitussive properties? A. Fentanyl B. Methadone C. Codeine D. Hydromorphone Rationale: Codeine suppresses cough reflex at lower doses and provides mild to moderate analgesia due to its conversion to morphine. Question 12 Which receptor is primarily responsible for opioid-induced euphoria?
Question 15 Which opioid is associated with neurotoxic metabolite accumulation causing seizures? A. Fentanyl B. Morphine C. Meperidine D. Oxycodone Rationale: Meperidine metabolizes to normeperidine, which can accumulate and cause CNS toxicity, including seizures. Question 16 What is the primary goal of pain management? A. Complete elimination of all pain in all patients B. Use opioids as first-line therapy C. Reduction of pain to improve function and quality of life D. Avoid use of non-opioid therapies Rationale: Modern pain management focuses on functional improvement and quality of life rather than complete elimination of pain, which is often unrealistic. Question 17 Which opioid has the longest half-life? A. Morphine B. Fentanyl
C. Methadone D. Hydromorphone Rationale: Methadone has a long and variable half-life, making it useful for maintenance therapy but requiring careful dosing. Question 18 Which condition is a contraindication for opioid use? A. Severe pain B. Cancer pain C. Postoperative pain D. Severe respiratory depression Rationale: Opioids further suppress respiration, so severe respiratory depression is a contraindication unless ventilatory support is available. Question 19 Which drug reverses opioid-induced respiratory depression? A. Flumazenil B. Atropine C. Naloxone D. Physostigmine Rationale: Naloxone competitively displaces opioids from receptors, rapidly reversing respiratory depression. Question 20
Rationale: Methylnaltrexone is a peripherally acting opioid antagonist that reverses gastrointestinal effects of opioids without affecting central analgesia. Question 23 Which opioid is preferred for moderate to severe cancer pain? A. Codeine B. Tramadol C. Morphine D. Dextromethorphan Rationale: Morphine is the gold standard for severe cancer pain due to its efficacy, availability, and titratability. Question 24 Which adverse effect is most associated with chronic opioid therapy? A. Hypotension B. Endocrine suppression (hypogonadism) C. Hyperthyroidism D. Leukocytosis Rationale: Long-term opioid use can suppress the hypothalamic-pituitary-gonadal axis, leading to reduced sex hormone production and symptoms such as fatigue and decreased libido. Question 25 Which opioid has NMDA receptor antagonist properties?
A. Codeine B. Morphine C. Methadone D. Hydrocodone Rationale: Methadone blocks NMDA receptors, which may help in neuropathic pain and reduce opioid tolerance. Question 26 Which is a key feature of opioid withdrawal? A. Bradycardia B. Constipation C. Diarrhea and agitation D. Hypothermia Rationale: Opioid withdrawal causes sympathetic overactivity leading to diarrhea, agitation, sweating, and tachycardia. Question 27 Which drug is used for neuropathic pain but is not an opioid? A. Morphine B. Fentanyl C. Gabapentin D. Methadone Rationale: Gabapentin modulates calcium channels and is effective for neuropathic pain, unlike opioids which act on opioid receptors.
Rationale: Mu-opioid receptor activation in the CNS leads to sedation as part of its CNS depressant effects. Question 31 Which is a non-opioid analgesic? A. Morphine B. Fentanyl C. Ibuprofen D. Codeine Rationale: Ibuprofen is an NSAID that reduces prostaglandin synthesis, unlike opioids which act on opioid receptors. Question 32 Which opioid is safest in hepatic impairment? A. Morphine B. Codeine C. Fentanyl D. Tramadol Rationale: Fentanyl has minimal active hepatic metabolism compared to other opioids, making it safer in liver dysfunction. Question 33 Which condition increases risk of opioid overdose?
A. Young age B. Chronic pain C. Concurrent benzodiazepine use D. Hypertension Rationale: Benzodiazepines potentiate respiratory depression when combined with opioids, significantly increasing overdose risk. Question 34 Which opioid is converted to morphine in the body? A. Fentanyl B. Methadone C. Codeine D. Tramadol Rationale: Codeine is a prodrug metabolized by CYP2D6 into morphine, which provides its analgesic effect. Question 35 Which is a synthetic opioid? A. Morphine B. Codeine C. Fentanyl D. Opium Rationale: Fentanyl is fully synthetic, unlike morphine and codeine which are natural opiates.
Rationale: Respiratory depression is the hallmark of opioid toxicity and the most dangerous manifestation. Question 39 Which drug is a mixed opioid agonist-antagonist? A. Morphine B. Fentanyl C. Pentazocine D. Methadone Rationale: Pentazocine acts as a kappa agonist and partial mu antagonist, producing analgesia with a ceiling effect. Question 40 Which is a common goal of multimodal pain therapy? A. Use only opioids B. Avoid all medications C. Combine different drug classes for synergistic pain relief D. Increase opioid dose only Rationale: Multimodal therapy uses opioids, NSAIDs, and adjuvants to improve pain control while reducing opioid requirements. Question 41 Which opioid is preferred for renal colic?
A. Methadone B. Codeine C. Morphine D. Tramadol Rationale: Morphine provides effective acute analgesia for severe pain such as renal colic. Question 42 Which receptor is NOT involved in opioid action? A. Mu B. Kappa C. Delta D. Beta adrenergic receptor Rationale: Opioids act on mu, kappa, and delta receptors, not adrenergic receptors. Question 43 Which opioid has the highest potency? A. Morphine B. Codeine C. Fentanyl D. Tramadol Rationale: Fentanyl is 50–100 times more potent than morphine. Question 44 Which is a sign of opioid withdrawal?
Question 47 Which is a contraindication for buprenorphine initiation? A. Mild pain B. Cancer pain C. Recent full opioid agonist use without withdrawal D. Chronic pain Rationale: Buprenorphine can precipitate withdrawal if started before full agonists are cleared. Question 48 Which opioid is safest in elderly patients? A. Meperidine B. Morphine C. Fentanyl (low dose) D. Codeine high dose Rationale: Fentanyl has predictable pharmacokinetics and no toxic metabolites, making it safer in elderly. Question 49 Which drug is NOT an opioid? A. Morphine B. Methadone C. Ketorolac D. Fentanyl
Rationale: Ketorolac is an NSAID, not an opioid. Question 50 Which opioid is commonly used in palliative care? A. Naloxone B. Ibuprofen C. Morphine D. Loratadine Rationale: Morphine is the cornerstone of palliative pain management. Question 51 Which opioid is commonly used for breakthrough cancer pain? A. Methadone B. Morphine extended-release C. Fentanyl (rapid-acting formulations) D. Codeine Rationale: Rapid-onset fentanyl formulations are ideal for breakthrough cancer pain due to their fast absorption and short duration, matching the transient nature of breakthrough pain episodes. Question 52 Which drug combination increases risk of fatal respiratory depression? A. Opioid + NSAID B. Opioid + acetaminophen
