NAPLEX COMPLETE EXAM PREP 2026–2027 Featuring Pharmacy Practice Questions, High-Yield Drug Review & Board Success Guide

NAPLEX COMPLETE EXAM PREP 2026–2027
Featuring Pharmacy Practice Questions, High-Yield
Drug Review & Board Success Guide

1. A patient receives a 500 mg IV bolus of a drug with a volume of distribution
of 25 L. What is the initial plasma concentration?
A. 10 mg/L
B. 15 mg/L
C. 20 mg/L
D. 25 mg/L
C. 20 mg/L
2. A drug has a half-life of 6 hours. Approximately how long will it take to
reach steady-state?
A. 12 hours
B. 18 hours
C. 24 hours
D. 30 hours
D. 30 hours
3. Which of the following drugs undergoes extensive first-pass metabolism?
A. Warfarin
B. Propranolol
C. Digoxin
D. Gentamicin
B. Propranolol
4. A patient has a creatinine clearance of 30 mL/min. Which antibiotic requires
dose adjustment?
A. Azithromycin
B. Doxycycline
C. Gentamicin
D. Ceftriaxone
C. Gentamicin
5. The volume of distribution of a drug is 100 L. This suggests the drug is:
A. Highly protein bound

, B. Distributed extensively into tissues
C. Restricted to the vascular space
D. Highly water soluble
B. Distributed extensively into tissues
6. A drug is 80% protein bound. What percentage of the drug is
pharmacologically active?
A. 10%
B. 20%
C. 50%
D. 80%
B. 20%
7. Which of the following is a cytochrome P450 enzyme inhibitor?
A. Rifampin
B. Phenytoin
C. Cimetidine
D. Carbamazepine
C. Cimetidine
8. A patient with hepatic impairment receiving a drug with high extraction ratio
would have:
A. Increased bioavailability
B. Decreased bioavailability
C. No change in bioavailability
D. Increased clearance
A. Increased bioavailability
9. The therapeutic index of a drug is defined as:
A. TD50/ED50
B. ED50/TD50
C. LD50/ED50
D. ED50/LD50
A. TD50/ED50
10.A drug has an elimination rate constant of 0.1 hr⁻¹. What is its half-life?
A. 3.45 hours
B. 6.93 hours
C. 10.5 hours

, D. 13.9 hours
B. 6.93 hours
11.Which drug requires monitoring of trough levels?
A. Vancomycin
B. Penicillin
C. Azithromycin
D. Cephalexin
A. Vancomycin
12.A drug is administered as a loading dose of 1000 mg followed by
maintenance dose of 500 mg daily. The loading dose achieves:
A. Steady state immediately
B. Steady state in 1 hour
C. Steady state in 4 hours
D. Steady state in 24 hours
A. Steady state immediately
13.Which of the following is an inducer of CYP3A4?
A. Grapefruit juice
B. Erythromycin
C. Rifampin
D. Ketoconazole
C. Rifampin
14.Bioavailability of an oral drug is affected by all EXCEPT:
A. First-pass metabolism
B. Gastric pH
C. Renal clearance
D. Food intake
C. Renal clearance
15.A drug with a narrow therapeutic index requires:
A. Less frequent monitoring
B. More frequent monitoring
C. No monitoring
D. Monitoring only at steady state
B. More frequent monitoring

, 16.The volume of distribution can be calculated using the formula:
A. Vd = Dose / C0
B. Vd = C0 / Dose
C. Vd = Dose × C0
D. Vd = C0 × Time
A. Vd = Dose / C0
17.Which of the following drugs is eliminated primarily by the kidneys?
A. Digoxin
B. Propranolol
C. Midazolam
D. Phenytoin
A. Digoxin
18.A patient has a low albumin level. Which drug may have increased free
concentration?
A. Warfarin
B. Gentamicin
C. Digoxin
D. Lithium
A. Warfarin
19.The clearance of a drug is directly proportional to:
A. Volume of distribution
B. Half-life
C. Renal function
D. Protein binding
C. Renal function
20.Which of the following drugs is a substrate for P-glycoprotein?
A. Digoxin
B. Aspirin
C. Acetaminophen
D. Lisinopril
A. Digoxin
21.Steady-state concentration is achieved after how many half-lives?
A. 2
B. 3
C. 4