Repeated USMLE Questions Step 1 Review- 122- Pharmacology

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Q- A 24-year-old man is started on isoniazid for latent tuberculosis. He is advised to take a vitamin supplement to prevent a potential side effect.

Which of the following supplements is most appropriate?

A- Vitamin B1

B- Vitamin B6

C- Vitamin B9

D- Vitamin B12

B- Vitamin B6- Isoniazid can cause peripheral neuropathy by depleting pyridoxine (Vitamin B6). Supplementation of Vitamin B6 prevents this side effect.



Q- A 65-year-old man with a history of atrial fibrillation presents with shortness of breath and ankle swelling. His medication list includes furosemide, warfarin, and metoprolol.

Which of the following is the most likely cause of his hypokalemia?

A- Furosemide

B- Metoprolol

C- Warfarin

A- Furosemide- Furosemide is a loop diuretic that causes loss of potassium, leading to hypokalemia. This is a common side effect.



Q- A patient taking lithium develops tremors, nausea, and confusion. His labs show elevated lithium levels.

Which of the following drugs most likely caused this toxicity?

A- Amlodipine

B- Hydrochlorothiazide

C- Losartan

D- Metformin

B- Hydrochlorothiazide- Thiazide diuretics decrease renal clearance of lithium, increasing the risk of lithium toxicity.

 

More Pharmacology MCQs

Check this Review Book for USMLE Step 1

 



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