Beta Blockers USMLE Step 1 Practice Question
A 46-year-old man with heart failure (EF 25%) presents with tender bilateral gynecomastia after 6 months of therapy. His vital signs show BP 118/76 mmHg, HR 58 bpm, RR 16, and temperature 37°C. Recent labs reveal potassium 5.2 mEq/L and creatinine 1.1 mg/dL. He denies testicular pain or masses. He currently takes lisinopril and the aldosterone antagonist initiated at his last visit. Which medication most likely caused his gynecomastia?
Answer choices
- AHydrochlorothiazide
- BAcetazolamide
- CFurosemide
- DAmiloride
- ESpironolactoneCorrect answer
- FEplerenone
See the full explanation
Get the correct-answer rationale, why each distractor is wrong, the underlying mechanism, and high-yield associations — plus adaptive practice that targets your weak areas — with a free MedBoardPRO account.