Meperidine hydrochloride MCQs With Answer is a focused study resource for B. Pharm students exploring the pharmacology, therapeutic uses, metabolism, adverse effects and clinical cautions of meperidine (pethidine). This collection emphasizes mechanism of action, pharmacokinetics including normeperidine neurotoxicity, drug interactions (MAOIs, SSRIs), dosing considerations, and formulation knowledge vital for safe dispensing and patient counseling. Questions are designed to reinforce core concepts, clinical application, and exam preparation with clear explanations and updated relevance to practice. Ideal for revision before pharmacology exams, practicals, and viva voce. Now let’s test your knowledge with 50 MCQs on this topic.
Q1. What class of drug is meperidine hydrochloride?
- Synthetic opioid analgesic derived from phenylpiperidine
- Natural opiate alkaloid
- Nonsteroidal anti-inflammatory drug
- Local anesthetic
Correct Answer: Synthetic opioid analgesic derived from phenylpiperidine
Q2. The primary mechanism of analgesic action of meperidine is:
- Inhibition of prostaglandin synthesis
- Agonism at mu-opioid receptors
- Antagonism of NMDA receptors
- Blockade of voltage-gated sodium channels
Correct Answer: Agonism at mu-opioid receptors
Q3. Which toxic metabolite of meperidine is associated with CNS excitation and seizures?
- Normeperidine
- Morphine
- Hydromorphone
- Pethidone
Correct Answer: Normeperidine
Q4. Normeperidine accumulation is most likely in patients with:
- Renal impairment
- Acute skin infection
- Hyperthyroidism
- Iron deficiency anemia
Correct Answer: Renal impairment
Q5. Which of the following is a common adverse effect of meperidine?
- Respiratory depression
- Hypertension
- Hyperglycemia
- Increased platelet aggregation
Correct Answer: Respiratory depression
Q6. Meperidine has significant anticholinergic effects leading to which symptom?
- Mydriasis and dry mouth
- Excessive salivation
- Bradykinesia
- Diarrhea
Correct Answer: Mydriasis and dry mouth
Q7. Which drug interaction with meperidine can precipitate serotonin syndrome?
- Concurrent use with selective serotonin reuptake inhibitors (SSRIs)
- Concurrent use with beta-blockers
- Concurrent use with loop diuretics
- Concurrent use with calcium carbonate antacids
Correct Answer: Concurrent use with selective serotonin reuptake inhibitors (SSRIs)
Q8. Meperidine is contraindicated with which class of drugs due to risk of severe interactions?
- Monoamine oxidase inhibitors (MAOIs)
- ACE inhibitors
- Statins
- H2-receptor antagonists
Correct Answer: Monoamine oxidase inhibitors (MAOIs)
Q9. Which route of administration provides the most rapid onset for pain relief with meperidine?
- Intravenous injection
- Oral tablet
- Topical application
- Rectal suppository
Correct Answer: Intravenous injection
Q10. The hepatic metabolism of meperidine primarily involves which process?
- N-demethylation to normeperidine
- Glucuronidation to morphine-glucuronide
- Sulfation to pethidine sulfate
- Deamination to pethidone
Correct Answer: N-demethylation to normeperidine
Q11. Compared to morphine, meperidine is generally considered to have:
- Shorter duration of action
- Longer duration of action
- Greater oral bioavailability
- No risk of dependence
Correct Answer: Shorter duration of action
Q12. Which patient population should use meperidine with extreme caution due to metabolite accumulation?
- Elderly patients
- Young healthy adults
- Patients with seasonal allergies
- Athletes
Correct Answer: Elderly patients
Q13. In which clinical scenario is meperidine commonly avoided in modern practice?
- Chronic pain management
- Acute postoperative shivering (used as alternative)
- Short procedural analgesia
- Emergency severe pain when alternatives unavailable
Correct Answer: Chronic pain management
Q14. The seizure risk associated with meperidine is primarily due to:
- Neuroexcitatory properties of normeperidine
- Excessive histamine release
- Immune-mediated vasculitis
- Alpha-adrenergic blockade
Correct Answer: Neuroexcitatory properties of normeperidine
Q15. Which laboratory parameter is most relevant when monitoring patients on long-term meperidine?
- Renal function tests (serum creatinine)
- Fasting blood glucose
- Thyroid stimulating hormone
- Serum potassium
Correct Answer: Renal function tests (serum creatinine)
Q16. Meperidine produces analgesia primarily by acting on which part of the nervous system?
- Central nervous system
- Peripheral musculoskeletal junctions
- Gastrointestinal mucosa
- Cardiac conduction system
Correct Answer: Central nervous system
Q17. Which effect is less prominent with meperidine compared to morphine?
- Constipation
- Respiratory depression
- Analgesia
- Miosis
Correct Answer: Miosis
Q18. The legal classification of meperidine in many countries is:
- Controlled opioid (schedules vary by jurisdiction)
- Over-the-counter analgesic
- Unregulated supplement
- Prescription antihistamine
Correct Answer: Controlled opioid (schedules vary by jurisdiction)
Q19. Which symptom is a hallmark of acute opioid overdose including meperidine?
- Pinpoint pupils and severe respiratory depression
- High fever and rash
- Hypertension and tachycardia
- Excessive salivation and coughing
Correct Answer: Pinpoint pupils and severe respiratory depression
Q20. Which antidote is used to reverse opioid overdose caused by meperidine?
- Naloxone
- Flumazenil
- Atropine
- N-acetylcysteine
Correct Answer: Naloxone
Q21. Meperidine has local anesthetic-like properties due to weak action on:
- Sodium channels
- Calcium channels
- Potassium channels
- GABA receptors
Correct Answer: Sodium channels
Q22. Which clinical sign suggests normeperidine toxicity rather than simple opioid excess?
- Myoclonus and seizures
- Severe miosis alone
- Profound hypotension alone
- Excessive lacrimation
Correct Answer: Myoclonus and seizures
Q23. Which dosing advice is appropriate for meperidine in patients with impaired renal function?
- Avoid repeated dosing and reduce dose or use alternative
- Increase dose by 50% to overcome decreased clearance
- No adjustment required
- Switch to intramuscular route only
Correct Answer: Avoid repeated dosing and reduce dose or use alternative
Q24. Meperidine is often less favored in obstetric analgesia because it:
- Crosses the placenta and can depress neonatal respiration
- Increases uterine contractility excessively
- Causes fetal hypertension
- Is ineffective in labor pain
Correct Answer: Crosses the placenta and can depress neonatal respiration
Q25. Which statement about the oral bioavailability of meperidine is true?
- It has moderate oral bioavailability due to first-pass metabolism
- It is not absorbed orally at all
- It has nearly 100% oral bioavailability
- Oral use is associated with no systemic effects
Correct Answer: It has moderate oral bioavailability due to first-pass metabolism
Q26. Which pharmacokinetic parameter of meperidine is most affected in hepatic failure?
- Metabolic clearance
- Renal glomerular filtration rate
- GI absorption rate
- Plasma protein binding to albumin
Correct Answer: Metabolic clearance
Q27. Meperidine-induced histamine release can cause which clinical effect?
- Hypotension and flushing
- Profound hypoglycemia
- Increased urinary output
- Severe bradycardia only
Correct Answer: Hypotension and flushing
Q28. In therapeutic monitoring, which sign indicates adequate analgesia without significant opioid excess?
- Pain reduction with preserved respiratory rate
- Complete loss of consciousness
- Absence of pupillary reaction with apnea
- Severe agitation and hypertension
Correct Answer: Pain reduction with preserved respiratory rate
Q29. The chemical synonym often used for meperidine is:
- Pethidine
- Fentanyl
- Codeine
- Tramadol
Correct Answer: Pethidine
Q30. Which monitoring is important when meperidine is combined with benzodiazepines?
- Respiratory status and level of consciousness
- Serum sodium concentration
- Visual acuity
- Thyroid function tests
Correct Answer: Respiratory status and level of consciousness
Q31. Which receptor subtype has the highest affinity for meperidine’s analgesic effects?
- Mu-opioid receptor
- Beta-adrenergic receptor
- Histamine H1 receptor
- Dopamine D2 receptor
Correct Answer: Mu-opioid receptor
Q32. A pharmacist counseling a patient should warn about which common side effect of meperidine?
- Constipation and dizziness
- Hyperactivity and increased appetite
- Excessive tearing and weight loss
- Hypersalivation and hyperreflexia
Correct Answer: Constipation and dizziness
Q33. Which structural feature distinguishes meperidine from morphine chemically?
- Phenylpiperidine core
- Opiate alkaloid backbone
- Polypeptide chain
- Steroid nucleus
Correct Answer: Phenylpiperidine core
Q34. In case of suspected normeperidine-induced seizures, first-line management includes:
- Anticonvulsants such as benzodiazepines and stopping meperidine
- High-dose naloxone only
- Immediate dialysis without supportive care
- Administering MAOI to counteract toxicity
Correct Answer: Anticonvulsants such as benzodiazepines and stopping meperidine
Q35. Which statement about tolerance with repeated meperidine use is correct?
- Tolerance to analgesic effect may develop over time
- No tolerance develops ever
- Tolerance leads to improved analgesia
- Tolerance causes immediate anaphylaxis
Correct Answer: Tolerance to analgesic effect may develop over time
Q36. Which is a key counselling point for patients prescribed oral meperidine?
- Avoid driving or operating machinery until you know how it affects you
- Take double dose if pain persists immediately
- Combine with alcohol for faster effect
- Stop other prescribed medications without consulting doctor
Correct Answer: Avoid driving or operating machinery until you know how it affects you
Q37. Which property of meperidine contributes to its rapid onset when given IV?
- High lipid solubility
- Extensive protein binding only
- Poor membrane permeability
- Large molecular size
Correct Answer: High lipid solubility
Q38. In overdose, besides naloxone, which supportive measure is most important?
- Support airway and ventilation
- Immediate forced diuresis
- Administering beta-blockers
- Giving oral charcoal only
Correct Answer: Support airway and ventilation
Q39. Which of the following is a pharmacodynamic interaction with meperidine?
- Enhanced CNS depression with alcohol
- Reduced renal clearance by probenecid
- Altered absorption by antacids
- Inactivation by ultraviolet light
Correct Answer: Enhanced CNS depression with alcohol
Q40. For which indication has meperidine historically been preferred over morphine due to less biliary spasm?
- Biliary colic
- Chronic back pain
- Neuropathic pain of diabetes
- Inflammatory arthritis
Correct Answer: Biliary colic
Q41. Which formulation of meperidine is commonly used in hospitals?
- Injectable solution (IV/IM)
- Transdermal patch
- Inhalation aerosol
- Ophthalmic drops
Correct Answer: Injectable solution (IV/IM)
Q42. Which monitoring should be emphasized when initiating meperidine in elderly patients?
- Close monitoring for confusion, sedation and respiratory depression
- Only blood pressure once monthly
- Routine EKG only after 1 year
- No monitoring is necessary
Correct Answer: Close monitoring for confusion, sedation and respiratory depression
Q43. Which enzyme system is primarily responsible for meperidine metabolism?
- Cytochrome P450 hepatic enzymes
- Monoamine oxidase B in platelets
- Renal dehydrogenase only
- Lipase in adipose tissue
Correct Answer: Cytochrome P450 hepatic enzymes
Q44. Which clinical feature differentiates opioid-induced chest wall rigidity from typical respiratory depression?
- Stiffness of thoracic muscles causing ventilation difficulty
- Excessive bronchorrhea
- Isolated hypotension without respiratory compromise
- Profuse sweating alone
Correct Answer: Stiffness of thoracic muscles causing ventilation difficulty
Q45. Which patient history is a red flag before dispensing meperidine?
- History of seizures or seizure disorder
- History of seasonal hay fever only
- History of controlled hyperlipidemia on statin
- History of fractured bone 10 years ago
Correct Answer: History of seizures or seizure disorder
Q46. Which is true regarding tolerance and physical dependence to meperidine?
- Both tolerance and dependence can develop with prolonged use
- Tolerance never develops
- Dependence prevents any withdrawal symptoms
- Dependence occurs immediately after a single dose
Correct Answer: Both tolerance and dependence can develop with prolonged use
Q47. When comparing analgesic potency, meperidine is approximately how potent relative to morphine?
- Less potent than morphine (roughly one-third to one-tenth)
- Equal potency to morphine
- Ten times more potent than morphine
- Has no analgesic potency
Correct Answer: Less potent than morphine (roughly one-third to one-tenth)
Q48. Which counseling point is essential regarding storage and disposal of meperidine?
- Keep secure and dispose of unused medication according to regulations due to abuse potential
- Store in the freezer for stability
- Mix with household waste without precautions
- Share spare tablets with family for emergencies
Correct Answer: Keep secure and dispose of unused medication according to regulations due to abuse potential
Q49. Which symptom cluster suggests serotonin syndrome when meperidine is combined with SSRIs?
- Hyperthermia, hyperreflexia, myoclonus
- Bradycardia, hyporeflexia, dry skin
- Isolated cough and rhinorrhea
- Chronic constipation only
Correct Answer: Hyperthermia, hyperreflexia, myoclonus
Q50. Which alternative analgesic is preferred over meperidine for chronic noncancer pain due to safety profile?
- Morphine or other long-acting opioids with careful monitoring, or non-opioid multimodal therapy
- Continuous meperidine infusion indefinitely
- High-dose benzodiazepines alone
- Topical antibiotics
Correct Answer: Morphine or other long-acting opioids with careful monitoring, or non-opioid multimodal therapy
