Fentanyl citrate MCQs With Answer provide B. Pharm students a focused, Student-friendly review of this potent opioid analgesic. These practice questions cover fentanyl citrate pharmacology, mechanism of action at mu-opioid receptors, pharmacokinetics, dosing, formulations, adverse effects, drug interactions, stability, compounding and analytical methods. Emphasis on clinical uses, toxicity management, transdermal and parenteral formulations, bioavailability and regulatory classification helps students master therapeutics and pharmaceutical analysis. Well-designed MCQs reinforce critical thinking for exams, safe dispensing and laboratory assays. Clear explanations aid retention of concepts such as potency, onset, duration, metabolism and naloxone reversal protocols. Now let’s test your knowledge with 50 MCQs on this topic.
Q1. Which receptor subtype is primarily responsible for fentanyl’s analgesic effect?
- Delta opioid receptor
- Kappa opioid receptor
- Mu opioid receptor
- Nicotinic acetylcholine receptor
Correct Answer: Mu opioid receptor
Q2. Fentanyl is approximately how many times more potent than morphine on a weight basis?
- 5 times
- 25 times
- 100 times
- 500 times
Correct Answer: 100 times
Q3. Which physicochemical property of fentanyl contributes most to its rapid CNS penetration?
- High water solubility
- Low molecular weight
- High lipid solubility
- High protein binding
Correct Answer: High lipid solubility
Q4. The major metabolic pathway for fentanyl in the liver involves which enzyme family?
- CYP1A2
- CYP2D6
- CYP3A4
- UGT2B7
Correct Answer: CYP3A4
Q5. Which metabolite is primarily formed during hepatic metabolism of fentanyl?
- Norfentanyl
- Morphine-6-glucuronide
- Fentanyl glucuronide
- Desmethylfentanyl
Correct Answer: Norfentanyl
Q6. Chest wall rigidity is a known adverse effect most associated with:
- Oral fentanyl lozenges
- Low-dose transdermal fentanyl
- Rapid high‑dose IV fentanyl
- Topical fentanyl gels
Correct Answer: Rapid high‑dose IV fentanyl
Q7. Which formulation of fentanyl provides continuous analgesia for 72 hours?
- Immediate-release oral tablet
- Transdermal patch (Duragesic)
- Intramuscular depot injection
- Sublingual spray
Correct Answer: Transdermal patch (Duragesic)
Q8. Fentanyl citrate used in injections is the citrate salt mainly to improve:
- Stability at high temperatures
- Water solubility for parenteral use
- Lipid solubility for transdermal absorption
- Oral bioavailability
Correct Answer: Water solubility for parenteral use
Q9. Which clinical situation is an absolute contraindication for fentanyl administration without resuscitative equipment?
- Chronic neuropathic pain
- Acute bronchial asthma
- Postoperative analgesia
- Terminal cancer pain
Correct Answer: Acute bronchial asthma
Q10. The primary antidote for fentanyl-induced respiratory depression is:
- Flumazenil
- Naloxone
- Atropine
- Physostigmine
Correct Answer: Naloxone
Q11. Co-administration of fentanyl with strong CYP3A4 inhibitors (e.g., ketoconazole) will most likely produce:
- Decreased fentanyl plasma levels
- No change in fentanyl effects
- Increased fentanyl plasma levels and toxicity risk
- Fentanyl becoming inactive
Correct Answer: Increased fentanyl plasma levels and toxicity risk
Q12. Which analytical technique is most suitable for confirmatory identification of fentanyl in biological samples?
- Thin layer chromatography (TLC)
- Gas chromatography–mass spectrometry (GC-MS)
- UV-visible spectrophotometry
- Kjeldahl nitrogen analysis
Correct Answer: Gas chromatography–mass spectrometry (GC-MS)
Q13. Compared to morphine, fentanyl’s duration of action after a single IV bolus is generally:
- Longer
- Shorter
- Equal
- Indeterminate
Correct Answer: Shorter
Q14. Which property of transdermal fentanyl patches controls drug flux through skin?
- Aqueous solubility of fentanyl
- Patch surface area and concentration gradient
- pH of the skin surface
- Presence of hair follicles
Correct Answer: Patch surface area and concentration gradient
Q15. Which of the following is a common opioid-related adverse effect that often requires prophylactic management?
- Hypertension
- Constipation
- Hyperreflexia
- Polyuria
Correct Answer: Constipation
Q16. Fentanyl’s high lipophilicity results in which pharmacokinetic characteristic after repeated dosing?
- Rapid renal elimination without accumulation
- Minimal tissue distribution
- Tendency to accumulate in adipose tissue
- Inability to cross blood-brain barrier
Correct Answer: Tendency to accumulate in adipose tissue
Q17. When developing an HPLC assay for fentanyl in plasma, a commonly used sample cleanup method is:
- Soxhlet extraction
- Solid Phase Extraction (SPE)
- Direct injection without cleanup
- Distillation
Correct Answer: Solid Phase Extraction (SPE)
Q18. Which statement about fentanyl transdermal patches is correct?
- Patches are suitable for opioid‑naïve patients at full dose
- Patches provide immediate analgesia within 5 minutes
- Patches are intended for patients with stable opioid requirements
- Patches can be cut to adjust dose manually
Correct Answer: Patches are intended for patients with stable opioid requirements
Q19. In toxicology, the most reliable specimen to detect recent fentanyl exposure is:
- Hair sample
- Saliva collected weeks after exposure
- Urine or blood collected soon after exposure
- Nail clippings
Correct Answer: Urine or blood collected soon after exposure
Q20. Which warning is particularly important when combining fentanyl with benzodiazepines?
- Risk of hypertensive crisis
- Enhanced risk of severe respiratory depression and sedation
- Immediate antagonism of fentanyl by benzodiazepines
- No clinically relevant interaction
Correct Answer: Enhanced risk of severe respiratory depression and sedation
Q21. The term “lozenge” (e.g., actiq) for fentanyl refers to which route of administration?
- Intravenous bolus
- Transdermal iontophoretic delivery
- Buccal/transmucosal delivery via oral cavity
- Intranasal spray
Correct Answer: Buccal/transmucosal delivery via oral cavity
Q22. Which factor most increases the risk of fentanyl overdose in a patient using transdermal patches?
- Applying patch to non-hairy skin
- Using external heat sources over the patch
- Wearing clothing over the patch
- Changing patch every 72 hours as recommended
Correct Answer: Using external heat sources over the patch
Q23. Fentanyl citrate differs from fentanyl base mainly by:
- Having a different opioid receptor target
- Being less potent as an analgesic
- Having improved aqueous solubility
- Being metabolized by entirely different pathways
Correct Answer: Having improved aqueous solubility
Q24. Which controlled substance schedule does fentanyl generally fall under in many countries (e.g., USA)?
- Schedule I (no accepted medical use)
- Schedule II (high potential for abuse, medical use)
- Schedule IV (low potential for abuse)
- Not a controlled substance
Correct Answer: Schedule II (high potential for abuse, medical use)
Q25. In a laboratory stability study, fentanyl solutions stored at room temperature are most vulnerable to degradation by:
- Oxidation and hydrolysis over prolonged exposure
- Complete insensitivity to light and oxygen
- Rapid polymerization
- Nitrosation reactions in neutral pH
Correct Answer: Oxidation and hydrolysis over prolonged exposure
Q26. Which clinical sign is most characteristic of acute opioid toxicity including fentanyl?
- Mydriasis (dilated pupils)
- Miosis (constricted pupils)
- Hyperthermia
- Increased bowel sounds
Correct Answer: Miosis (constricted pupils)
Q27. For forensic differentiation, which property helps distinguish fentanyl from fentanyl analogs?
- Exact retention time in chromatographic methods and mass spectral fragmentation pattern
- Color change on a pH strip
- Basic solubility in water only
- Odor detectable by olfactory testing
Correct Answer: Exact retention time in chromatographic methods and mass spectral fragmentation pattern
Q28. Which dosing consideration is essential when converting a patient from morphine to transdermal fentanyl?
- Direct 1:1 mg replacement by weight is appropriate
- Use equianalgesic conversion charts and account for incomplete cross-tolerance
- No need to adjust dose, just start at maximum patch strength
- Convert based solely on patient age
Correct Answer: Use equianalgesic conversion charts and account for incomplete cross-tolerance
Q29. Which laboratory matrix is least useful for detecting historic long-term fentanyl use?
- Hair
- Toenails
- Urine collected immediately after use
- Blood collected months after last use
Correct Answer: Blood collected months after last use
Q30. A pharmacist preparing an IV fentanyl admixture should be most concerned about which compatibility issue?
- Formation of insoluble precipitate with alkaline solutions
- Fentanyl forming chelates with metal needles
- Being inactivated by saline
- Explosive decomposition on contact with glass
Correct Answer: Formation of insoluble precipitate with alkaline solutions
Q31. The therapeutic index of fentanyl is typically:
- Narrow, indicating small margin between effective and toxic doses
- Extremely wide and safe
- Undefined, because fentanyl has no toxicity
- So wide that dosage is not clinically relevant
Correct Answer: Narrow, indicating small margin between effective and toxic doses
Q32. Which of the following fentanyl analogs is known for extremely high potency and has been implicated in overdose outbreaks?
- Sufentanil
- Alfentanil
- Carfentanil
- Remifentanil
Correct Answer: Carfentanil
Q33. In pharmacovigilance, a common signal for fentanyl misuse is:
- Consistently low prescription rates
- Increased reports of severe respiratory depression and unintentional exposures
- Lack of adverse event reports
- Exclusive use in inpatient settings
Correct Answer: Increased reports of severe respiratory depression and unintentional exposures
Q34. Remifentanil differs from fentanyl pharmacokinetically by being:
- Metabolized by plasma esterases with ultra-short action
- Exclusively renally excreted unchanged
- More lipophilic and longer acting
- Inactive until metabolized by CYP3A4
Correct Answer: Metabolized by plasma esterases with ultra-short action
Q35. For accurate dosing of fentanyl in small-volume parenteral preparations, pharmacists must be especially careful about:
- Using approximated concentrations rather than verified calculations
- Precise calculation and dilution to avoid dosing errors due to high potency
- Assuming every vial contains the same concentration
- Ignoring aseptic technique for opioids
Correct Answer: Precise calculation and dilution to avoid dosing errors due to high potency
Q36. A patient on chronic transdermal fentanyl develops fever; increased temperature may cause:
- Reduced fentanyl absorption from the patch
- Increased fentanyl release and risk of toxicity
- No change in fentanyl pharmacokinetics
- Immediate cessation of analgesic effect
Correct Answer: Increased fentanyl release and risk of toxicity
Q37. Which monitoring parameter is most important during fentanyl infusion in the ICU?
- Serum sodium concentration every hour
- Continuous respiratory rate and oxygen saturation monitoring
- Liver function tests every 5 minutes
- Daily hemoglobin only
Correct Answer: Continuous respiratory rate and oxygen saturation monitoring
Q38. In formulation development, which excipient property would be least desirable for a transdermal fentanyl patch?
- Enhancer that increases skin permeability
- Occlusive backing to reduce evaporation
- Highly volatile solvent that evaporates quickly leaving inconsistent dosing
- Pressure-sensitive adhesive for secure contact
Correct Answer: Highly volatile solvent that evaporates quickly leaving inconsistent dosing
Q39. In a patient with hepatic impairment, fentanyl dosing often requires:
- No adjustment because fentanyl is not metabolized by liver
- Caution and potential dose reduction due to reduced clearance
- Major dose increases to overcome hepatic dysfunction
- Switch to oral fentanyl for better control
Correct Answer: Caution and potential dose reduction due to reduced clearance
Q40. Which statement about naloxone use for fentanyl overdose is correct?
- Naloxone is ineffective against fentanyl
- Higher or repeated naloxone doses may be required due to fentanyl potency and duration
- One fixed low dose always suffices regardless of exposure
- Naloxone permanently reverses opioid dependence
Correct Answer: Higher or repeated naloxone doses may be required due to fentanyl potency and duration
Q41. In therapeutic drug monitoring of fentanyl, measurement is most often done to:
- Ensure complete absence of drug in patient
- Assess compliance and avoid toxicity in special situations
- Directly predict analgesic efficacy for all patients
- Replace clinical monitoring entirely
Correct Answer: Assess compliance and avoid toxicity in special situations
Q42. The onset of analgesia after IV fentanyl administration is typically within:
- 30–60 minutes
- 10–20 minutes
- 1–5 minutes
- 24 hours
Correct Answer: 1–5 minutes
Q43. Which of the following is an appropriate safe-handling practice for fentanyl patches?
- Wearing gloves when applying or removing patches to avoid accidental exposure
- Applying multiple patches to reach a dose faster
- Cutting patches to titrate dose
- Leaving old patches on when applying new ones
Correct Answer: Wearing gloves when applying or removing patches to avoid accidental exposure
Q44. Transmucosal immediate-release fentanyl (TIRF) products are primarily indicated for:
- Chronic low-intensity aches
- Breakthrough cancer pain in opioid-tolerant patients
- First-line therapy for opioid-naïve acute pain
- Routine chronic noncancer pain in adolescents
Correct Answer: Breakthrough cancer pain in opioid-tolerant patients
Q45. Which factor does NOT significantly influence transdermal fentanyl absorption?
- Skin temperature
- Area of application
- Skin integrity at application site
- Patient blood type
Correct Answer: Patient blood type
Q46. When validating an LC-MS/MS method for fentanyl quantification, which parameter is essential?
- Linearity, accuracy, precision and lower limit of quantification
- Only colorimetric response
- Ability to detect any alkaloid without specificity
- Number of manual pipetting steps only
Correct Answer: Linearity, accuracy, precision and lower limit of quantification
Q47. Which statement about fentanyl-induced miosis is true?
- Miosis is a reliable sign of opioid effect but may be absent in hypoxic overdose
- Miosis indicates the patient is not opioid-intoxicated
- Miosis only occurs with morphine, not fentanyl
- Miosis always rules out mixed-drug intoxication
Correct Answer: Miosis is a reliable sign of opioid effect but may be absent in hypoxic overdose
Q48. Which practice helps reduce diversion and misuse of prescribed transdermal fentanyl?
- Prescribing the highest patch strength available routinely
- Providing clear patient education on use, storage and disposal and using prescription monitoring programs
- Not documenting prescriptions
- Encouraging sharing of unused patches with family
Correct Answer: Providing clear patient education on use, storage and disposal and using prescription monitoring programs
Q49. In compounding a topical fentanyl formulation for localized pain, a pharmacist should be most concerned about:
- Potential systemic absorption and resulting opioid effects
- Ensuring the product tastes pleasant
- Avoiding all skin-contact warnings
- Maximizing first-pass hepatic metabolism
Correct Answer: Potential systemic absorption and resulting opioid effects
Q50. Which educational point is essential when counseling a patient switching from oral opioid to transdermal fentanyl?
- Stop all other opioids immediately with no overlap
- Expect analgesia to begin immediately after patch application
- Understand equianalgesic conversion, allow for onset delay, and monitor for withdrawal or toxicity
- Apply multiple patches to achieve faster pain relief
Correct Answer: Understand equianalgesic conversion, allow for onset delay, and monitor for withdrawal or toxicity
