NORTH AMERICAN PHARMACIST
LICENSURE EXAMINATION (NAPLEX)
PRACTICE EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
| INSTANT DOWNLOAD PDF
1. A patient is prescribed warfarin. Which lab test is used to monitor therapy?
A. aPTT
B. INR
C. Platelet count
D. Bleeding time
Correct Answer: B. INR
Rationale: INR (International Normalized Ratio) is the standard test used to
monitor warfarin therapy because it reflects the extrinsic coagulation pathway
and ensures therapeutic anticoagulation while minimizing bleeding risk.
2. Which medication is most appropriate for acute anaphylaxis?
A. Diphenhydramine
B. Epinephrine
C. Albuterol
D. Prednisone
Correct Answer: B. Epinephrine
Rationale: Epinephrine is first-line treatment for anaphylaxis because it rapidly
,reverses bronchoconstriction, hypotension, and airway edema through alpha
and beta adrenergic effects.
3. A patient with hypertension and asthma should avoid which drug class?
A. ACE inhibitors
B. Beta-blockers
C. Calcium channel blockers
D. Diuretics
Correct Answer: B. Beta-blockers
Rationale: Non-selective beta-blockers may cause bronchoconstriction by
blocking beta-2 receptors in the lungs, worsening asthma symptoms.
4. What is the antidote for acetaminophen overdose?
A. Naloxone
B. Flumazenil
C. N-acetylcysteine
D. Vitamin K
Correct Answer: C. N-acetylcysteine
Rationale: N-acetylcysteine replenishes glutathione stores, preventing liver
damage from toxic acetaminophen metabolite NAPQI.
5. Which antibiotic requires renal dose adjustment?
A. Azithromycin
B. Vancomycin
C. Doxycycline
D. Clindamycin
Correct Answer: B. Vancomycin
Rationale: Vancomycin is primarily excreted by the kidneys, so dosing must be
adjusted in renal impairment to prevent toxicity.
, 6. What is the mechanism of action of omeprazole?
A. H2 receptor antagonist
B. Proton pump inhibitor
C. Anticholinergic
D. Neutralizing gastric acid
Correct Answer: B. Proton pump inhibitor
Rationale: Omeprazole irreversibly inhibits the H+/K+ ATPase pump in gastric
parietal cells, reducing acid secretion.
7. Which drug is contraindicated in pregnancy due to teratogenicity?
A. Amoxicillin
B. Lisinopril
C. Cephalexin
D. Azithromycin
Correct Answer: B. Lisinopril
Rationale: ACE inhibitors like lisinopril can cause fetal renal damage,
oligohydramnios, and congenital malformations.
8. Which electrolyte abnormality is associated with digoxin toxicity?
A. Hypercalcemia
B. Hypokalemia
C. Hypernatremia
D. Hypermagnesemia
Correct Answer: B. Hypokalemia
Rationale: Low potassium increases digoxin binding to Na+/K+ ATPase,
increasing toxicity risk.
9. What is the antidote for opioid overdose?
A. Flumazenil
B. Naloxone
LICENSURE EXAMINATION (NAPLEX)
PRACTICE EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
| INSTANT DOWNLOAD PDF
1. A patient is prescribed warfarin. Which lab test is used to monitor therapy?
A. aPTT
B. INR
C. Platelet count
D. Bleeding time
Correct Answer: B. INR
Rationale: INR (International Normalized Ratio) is the standard test used to
monitor warfarin therapy because it reflects the extrinsic coagulation pathway
and ensures therapeutic anticoagulation while minimizing bleeding risk.
2. Which medication is most appropriate for acute anaphylaxis?
A. Diphenhydramine
B. Epinephrine
C. Albuterol
D. Prednisone
Correct Answer: B. Epinephrine
Rationale: Epinephrine is first-line treatment for anaphylaxis because it rapidly
,reverses bronchoconstriction, hypotension, and airway edema through alpha
and beta adrenergic effects.
3. A patient with hypertension and asthma should avoid which drug class?
A. ACE inhibitors
B. Beta-blockers
C. Calcium channel blockers
D. Diuretics
Correct Answer: B. Beta-blockers
Rationale: Non-selective beta-blockers may cause bronchoconstriction by
blocking beta-2 receptors in the lungs, worsening asthma symptoms.
4. What is the antidote for acetaminophen overdose?
A. Naloxone
B. Flumazenil
C. N-acetylcysteine
D. Vitamin K
Correct Answer: C. N-acetylcysteine
Rationale: N-acetylcysteine replenishes glutathione stores, preventing liver
damage from toxic acetaminophen metabolite NAPQI.
5. Which antibiotic requires renal dose adjustment?
A. Azithromycin
B. Vancomycin
C. Doxycycline
D. Clindamycin
Correct Answer: B. Vancomycin
Rationale: Vancomycin is primarily excreted by the kidneys, so dosing must be
adjusted in renal impairment to prevent toxicity.
, 6. What is the mechanism of action of omeprazole?
A. H2 receptor antagonist
B. Proton pump inhibitor
C. Anticholinergic
D. Neutralizing gastric acid
Correct Answer: B. Proton pump inhibitor
Rationale: Omeprazole irreversibly inhibits the H+/K+ ATPase pump in gastric
parietal cells, reducing acid secretion.
7. Which drug is contraindicated in pregnancy due to teratogenicity?
A. Amoxicillin
B. Lisinopril
C. Cephalexin
D. Azithromycin
Correct Answer: B. Lisinopril
Rationale: ACE inhibitors like lisinopril can cause fetal renal damage,
oligohydramnios, and congenital malformations.
8. Which electrolyte abnormality is associated with digoxin toxicity?
A. Hypercalcemia
B. Hypokalemia
C. Hypernatremia
D. Hypermagnesemia
Correct Answer: B. Hypokalemia
Rationale: Low potassium increases digoxin binding to Na+/K+ ATPase,
increasing toxicity risk.
9. What is the antidote for opioid overdose?
A. Flumazenil
B. Naloxone
