NAPLEX (North American Pharmacist
Licensure) Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. A patient is prescribed warfarin. Which laboratory value is primarily
used to monitor therapy?
A. aPTT
B. Bleeding time
C. INR
D. Platelet count
Correct Answer: C. INR
Rationale: INR is the standard test used to monitor warfarin therapy
effectiveness and safety.
2. Which insulin has the fastest onset of action?
A. Glargine
B. NPH
C. Lispro
D. Detemir
Correct Answer: C. Lispro
Rationale: Rapid-acting insulins like lispro have the fastest onset
(about 15 minutes).
3. A patient taking ACE inhibitors should be monitored for which adverse
effect?
A. Hypokalemia
B. Hyperkalemia
, C. Hypoglycemia
D. Hypernatremia
Correct Answer: B. Hyperkalemia
Rationale: ACE inhibitors reduce aldosterone leading to potassium
retention.
4. Which drug is used as an antidote for heparin overdose?
A. Vitamin K
B. Protamine sulfate
C. Naloxone
D. Acetylcysteine
Correct Answer: B. Protamine sulfate
Rationale: Protamine sulfate binds and inactivates heparin.
5. Which class of drugs is contraindicated in pregnancy due to
teratogenicity?
A. Penicillins
B. ACE inhibitors
C. Cephalosporins
D. Macrolides
Correct Answer: B. ACE inhibitors
Rationale: ACE inhibitors cause fetal renal damage and
malformations.
6. What is the mechanism of action of omeprazole?
A. H2 receptor antagonist
B. Proton pump inhibitor
C. Antacid
D. Mucosal protector
Correct Answer: B. Proton pump inhibitor
Rationale: Omeprazole irreversibly inhibits H+/K+ ATPase in gastric
parietal cells.
7. Which electrolyte imbalance is associated with loop diuretics?
A. Hyperkalemia
B. Hypokalemia
, C. Hypercalcemia
D. Hypernatremia
Correct Answer: B. Hypokalemia
Rationale: Loop diuretics increase potassium excretion.
8. Which antibiotic is most effective against MRSA?
A. Amoxicillin
B. Vancomycin
C. Azithromycin
D. Ciprofloxacin
Correct Answer: B. Vancomycin
Rationale: Vancomycin is effective against methicillin-resistant
Staphylococcus aureus.
9. Which drug is used for opioid overdose?
A. Flumazenil
B. Naloxone
C. Atropine
D. Physostigmine
Correct Answer: B. Naloxone
Rationale: Naloxone is an opioid receptor antagonist used in
overdose.
10. Which vitamin deficiency causes scurvy?
A. Vitamin A
B. Vitamin C
C. Vitamin D
D. Vitamin K
Correct Answer: B. Vitamin C
Rationale: Vitamin C deficiency leads to impaired collagen synthesis
causing scurvy.
11. Which medication is contraindicated in asthma patients due to
bronchoconstriction?
A. Propranolol
B. Metoprolol
Licensure) Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. A patient is prescribed warfarin. Which laboratory value is primarily
used to monitor therapy?
A. aPTT
B. Bleeding time
C. INR
D. Platelet count
Correct Answer: C. INR
Rationale: INR is the standard test used to monitor warfarin therapy
effectiveness and safety.
2. Which insulin has the fastest onset of action?
A. Glargine
B. NPH
C. Lispro
D. Detemir
Correct Answer: C. Lispro
Rationale: Rapid-acting insulins like lispro have the fastest onset
(about 15 minutes).
3. A patient taking ACE inhibitors should be monitored for which adverse
effect?
A. Hypokalemia
B. Hyperkalemia
, C. Hypoglycemia
D. Hypernatremia
Correct Answer: B. Hyperkalemia
Rationale: ACE inhibitors reduce aldosterone leading to potassium
retention.
4. Which drug is used as an antidote for heparin overdose?
A. Vitamin K
B. Protamine sulfate
C. Naloxone
D. Acetylcysteine
Correct Answer: B. Protamine sulfate
Rationale: Protamine sulfate binds and inactivates heparin.
5. Which class of drugs is contraindicated in pregnancy due to
teratogenicity?
A. Penicillins
B. ACE inhibitors
C. Cephalosporins
D. Macrolides
Correct Answer: B. ACE inhibitors
Rationale: ACE inhibitors cause fetal renal damage and
malformations.
6. What is the mechanism of action of omeprazole?
A. H2 receptor antagonist
B. Proton pump inhibitor
C. Antacid
D. Mucosal protector
Correct Answer: B. Proton pump inhibitor
Rationale: Omeprazole irreversibly inhibits H+/K+ ATPase in gastric
parietal cells.
7. Which electrolyte imbalance is associated with loop diuretics?
A. Hyperkalemia
B. Hypokalemia
, C. Hypercalcemia
D. Hypernatremia
Correct Answer: B. Hypokalemia
Rationale: Loop diuretics increase potassium excretion.
8. Which antibiotic is most effective against MRSA?
A. Amoxicillin
B. Vancomycin
C. Azithromycin
D. Ciprofloxacin
Correct Answer: B. Vancomycin
Rationale: Vancomycin is effective against methicillin-resistant
Staphylococcus aureus.
9. Which drug is used for opioid overdose?
A. Flumazenil
B. Naloxone
C. Atropine
D. Physostigmine
Correct Answer: B. Naloxone
Rationale: Naloxone is an opioid receptor antagonist used in
overdose.
10. Which vitamin deficiency causes scurvy?
A. Vitamin A
B. Vitamin C
C. Vitamin D
D. Vitamin K
Correct Answer: B. Vitamin C
Rationale: Vitamin C deficiency leads to impaired collagen synthesis
causing scurvy.
11. Which medication is contraindicated in asthma patients due to
bronchoconstriction?
A. Propranolol
B. Metoprolol
