SGrade/USMLE Step 1/Pharmacology — Core Concepts
Pharmacology — Core Concepts Practice Questions
This topic covers essential Pharmacology principles as tested in USMLE Step 1.
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Sample questions
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A 65-year-old male on warfarin for atrial fibrillation starts fluconazole for a fungal infection. Two days later, his international normalized ratio (INR) is significantly elevated, and he experiences epistaxis. The patient denies any dietary changes or missed warfarin doses.
Examiner's Design Intent
Tests understanding of CYP450 enzyme inhibition as a mechanism for clinically significant drug interactions, specifically the warfarin-fluconazole interaction that commonly causes bleeding complications in clinical pract…
A novel antibiotic is administered intravenously to a 45-year-old male. After reaching steady state, a plasma drug concentration of 10 mg/L is measured. The total dose administered was 500 mg.
Examiner's Design Intent
Tests fundamental pharmacokinetic calculation skills and understanding that volume of distribution is a mathematical parameter, not anatomical volume
A 30-year-old healthy male receives a single dose of a drug. Over time, the drug concentration in his plasma decreases by a constant percentage per hour.
Examiner's Design Intent
Tests foundational understanding of pharmacokinetic order definitions using percentage-based elimination as the key discriminator
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