NAPLEX Practice Questions
1. A 5-year-old female weighing 40 lbs requires acetaminophen for mild pain. The
pharmacy has acetaminophen liquid 160 mg/5 mL. What is an appropriate dose?
A. 3 mL q4 hours
B. 6 mL q6
...
NAPLEX Practice Questions
1. A 5-year-old female weighing 40 lbs requires acetaminophen for mild pain. The
pharmacy has acetaminophen liquid 160 mg/5 mL. What is an appropriate dose?
A. 3 mL q4 hours
B. 6 mL q6 hours
C. 9 mL q12 hours
D. 11 mL q6 hours
Answer: B
Rationale:
*Step 1: Convert lbs to kg: 40 lbs ÷ 2.2 = 18.18 kg.*
*Step 2: Acetaminophen pediatric dosing is 10-15 mg/kg/dose q4-6h. Using 10 mg/kg:
10 mg × 18.18 kg = 181.8 mg/dose.*
*Step 3: The concentration is 160 mg/5 mL = 32 mg/mL.*
*Step 4: 181.8 mg ÷ 32 mg/mL = 5.68 mL (round to 6 mL). Option A (3 mL) provides
only about 5 mg/kg, which is subtherapeutic. Option C (9 mL q12h) would be
appropriate for 15 mg/kg dosing but incorrect frequency. Option D (11 mL) provides
approximately 20 mg/kg, exceeding the recommended dose .*
2. MK is a 69-year-old male with osteoarthritis, hypertension, and dyslipidemia.
Current medications: Advil 400 mg q6h PRN, Benicar HCT 40/25 mg daily, Lipitor
20 mg daily, Tylenol 650 mg q6h PRN. BP is 139/84 mmHg. The addition of which
antihypertensive is most appropriate?
A. Chlorthalidone
B. Hydralazine
C. Lopressor (metoprolol tartrate)
D. Lotensin (benazepril)
E. Procardia XL (nifedipine extended-release)
Answer: E
Rationale:
*This patient's BP remains above goal (<130/80 mmHg) despite an ARB/thiazide
combination. Adding a dihydropyridine calcium channel blocker (nifedipine XL) is
appropriate as it represents a different preferred drug class. Option A (chlorthalidone)
duplicates the current thiazide therapy. Option B (hydralazine) is not a preferred agent
due to adverse effects. Option C (beta-blockers) are less effective for BP lowering
without comorbidities. Option D (ACE inhibitor) should not be combined with an ARB
due to increased risk of hyperkalemia and renal impairment .*
3. A 74-year-old male with dementia is being evaluated for new medications.
Which agents could worsen his cognitive symptoms? (Select ALL that apply)
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