Chronic pain management: pharmacologic and non-pharmacologic MCQs With Answer

Chronic pain management: pharmacologic and non-pharmacologic MCQs With Answer

Introduction: This quiz collection is designed for M.Pharm students taking Pharmacotherapeutics II (MPP 202T) to deepen understanding of chronic pain mechanisms, evidence-based pharmacologic strategies, and non-pharmacologic interventions. Questions emphasize drug mechanisms, guideline-based first-line choices, safety considerations (renal/hepatic impairment, interactions, opioid risks), adjuvant classes used in neuropathic and centralized pain, and interventional and rehabilitative techniques. Each item encourages applied knowledge useful for clinical decision-making, medication selection, monitoring, and integration of multidisciplinary therapies. Detailed but focused, these MCQs aim to prepare students for exams and clinical practice in pain management.

Q1. Which of the following best describes the primary mechanism by which gabapentin reduces neuropathic pain?

• Direct agonism at GABA-A receptors in the spinal cord
• Competitive NMDA receptor antagonism
• Binding to the α2δ subunit of voltage-gated calcium channels, reducing excitatory neurotransmitter release
• Inhibition of monoamine oxidase to increase serotonin and norepinephrine

Correct Answer: Binding to the α2δ subunit of voltage-gated calcium channels, reducing excitatory neurotransmitter release

Q2. Tramadol’s analgesic effect is best explained by which combination of mechanisms?

• Pure mu-opioid receptor agonism without monoamine effects
• NMDA receptor antagonism and sodium channel blockade
• Weak mu-opioid receptor agonism plus inhibition of serotonin and norepinephrine reuptake
• Selective kappa-opioid agonism and GABAergic facilitation

Correct Answer: Weak mu-opioid receptor agonism plus inhibition of serotonin and norepinephrine reuptake

Q3. According to major guidelines for diabetic peripheral neuropathy, which agent is considered a first-line pharmacologic treatment?

• Amitriptyline (tricyclic antidepressant)
• Duloxetine (SNRI)
• Ibuprofen (NSAID)
• Oral morphine

Correct Answer: Duloxetine (SNRI)

Q4. What is the principal rationale for performing opioid rotation in chronic pain patients?

• To increase total opioid exposure and accelerate tolerance
• To reduce cost by substituting cheaper opioids
• To improve analgesia or reduce toxicity by switching when there is incomplete cross-tolerance or intolerable adverse effects
• To avoid monitoring requirements associated with a single opioid

Correct Answer: To improve analgesia or reduce toxicity by switching when there is incomplete cross-tolerance or intolerable adverse effects

Q5. Which drug combination carries a clinically significant risk of serotonin syndrome in a patient treated for chronic pain?

• Ibuprofen and acetaminophen
• Tramadol combined with a selective serotonin reuptake inhibitor (SSRI)
• Topical lidocaine patch plus oral pregabalin
• Oxycodone with cyclobenzaprine

Correct Answer: Tramadol combined with a selective serotonin reuptake inhibitor (SSRI)

Q6. For refractory neuropathic pain in specialized settings, which NMDA receptor antagonist is commonly used as an intravenous infusion for analgesia?

• Lidocaine (systemic infusion)
• IV ketamine infusion
• Oral memantine at standard dementia doses
• Oral dextromethorphan single dose

Correct Answer: IV ketamine infusion

Q7. Tricyclic antidepressants (TCAs) relieve chronic neuropathic pain primarily through which pharmacologic actions?

• Pure opioid receptor agonism and histamine blockade
• Inhibition of serotonin and norepinephrine reuptake and modulation of sodium channel activity
• COX inhibition and platelet aggregation reduction
• Potentiation of GABAergic transmission exclusively

Correct Answer: Inhibition of serotonin and norepinephrine reuptake and modulation of sodium channel activity

Q8. Which topical therapy is a guideline-recommended option for localized neuropathic pain such as postherpetic neuralgia?

• Topical ketamine 1% cream
• Lidocaine 5% patch
• Topical diclofenac gel
• Topical benzocaine aerosol

Correct Answer: Lidocaine 5% patch

Q9. Which clinical findings are most consistent with central sensitization contributing to chronic pain?

• Pain that strictly follows dermatomal distribution without increased sensitivity
• Allodynia (pain from non-painful stimuli) and hyperalgesia (increased response to painful stimuli)
• Purely nocturnal pain relieved by NSAIDs
• Pain only at the site of visible tissue injury with normal sensory testing

Correct Answer: Allodynia (pain from non-painful stimuli) and hyperalgesia (increased response to painful stimuli)

Q10. Methadone has unique properties that affect its use in chronic pain. Which statement best characterizes methadone?

• Methadone has a short, predictable half-life and negligible drug interactions
• Methadone is purely a peripheral opioid without central effects
• Methadone has a long and highly variable half-life and NMDA receptor antagonism, requiring careful dose titration and monitoring
• Methadone is ideal for rapid dose escalation in acute pain due to low accumulation risk

Correct Answer: Methadone has a long and highly variable half-life and NMDA receptor antagonism, requiring careful dose titration and monitoring

Q11. Which analgesic is a selective COX-2 inhibitor and is associated with lower gastrointestinal risk but potential cardiovascular risk?

• Ibuprofen
• Naproxen
• Celecoxib
• Aspirin

Correct Answer: Celecoxib

Q12. Opioid-induced hyperalgesia (OIH) is best described as which clinical phenomenon?

• Complete loss of analgesic effect due to opioid receptor mutations
• Decreased pain sensitivity when opioids are increased
• Paradoxical increase in pain sensitivity and worsening pain despite escalating opioid doses
• Allergic reaction presenting with urticaria and bronchospasm

Correct Answer: Paradoxical increase in pain sensitivity and worsening pain despite escalating opioid doses

Q13. Which pharmacologic agent is FDA-approved and considered a treatment option for fibromyalgia with demonstrated benefit on pain and function?

• Pregabalin
• Naproxen
• Tramadol (as sole therapy)
• Subcutaneous insulin

Correct Answer: Pregabalin

Q14. Transcutaneous electrical nerve stimulation (TENS) is thought to reduce pain primarily by which mechanism?

• Stimulating A-delta fibers to increase nociceptive transmission
• Activating A-beta fibers to inhibit nociceptive transmission in the dorsal horn (gate control)
• Blocking peripheral opioid receptors
• Providing systemic anti-inflammatory effects through COX inhibition

Correct Answer: Activating A-beta fibers to inhibit nociceptive transmission in the dorsal horn (gate control)

Q15. Spinal cord stimulation provides analgesia mainly through which of the following mechanisms?

• Selective ablation of dorsal root ganglia
• Activation of dorsal column fibers producing paresthesia and inhibition of pain transmission in dorsal horn circuits
• Systemic delivery of local anesthetic to the cerebrospinal fluid
• Permanent denervation of peripheral nociceptors

Correct Answer: Activation of dorsal column fibers producing paresthesia and inhibition of pain transmission in dorsal horn circuits

Q16. Which local anesthetic is commonly chosen for single-injection peripheral nerve blocks when a long duration of analgesia is desired?

• Lidocaine
• Procaine
• Bupivacaine
• Chloroprocaine

Correct Answer: Bupivacaine

Q17. What is the commonly stated maximum daily dose of acetaminophen for adults to minimize hepatotoxicity risk in typical clinical practice?

• 1 gram per day
• 2 grams per day
• 4 grams per day
• 6 grams per day

Correct Answer: 4 grams per day

Q18. Which opioid is generally preferred in patients with significant renal impairment because it lacks active renally excreted metabolites that accumulate?

• Morphine
• Hydromorphone (with caution)
• Fentanyl
• Codeine

Correct Answer: Fentanyl

Q19. To diagnostically confirm facet (zygapophyseal) joint–mediated back pain, which targeted interventional block is most appropriate?

• Medial branch nerve block
• Caudal epidural steroid injection
• Intra-articular sacroiliac joint injection
• Percutaneous nucleoplasty

Correct Answer: Medial branch nerve block

Q20. Which non-pharmacologic psychological intervention has the strongest evidence for improving coping, function, and pain outcomes in chronic pain patients?

• Hypnosis without active cognitive components
• Cognitive-behavioral therapy (CBT)
• Unstructured supportive counseling alone
• Exposure to repeated high-intensity pain stimuli

Correct Answer: Cognitive-behavioral therapy (CBT)

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