Cardiovascular pharmacology · USMLE Step 1

Which diuretic acts on the distal convoluted tubule by inhibiting the Na⁺/Cl⁻ cotransporter, leading to lowered blood pressure?

  1. Furosemide
  2. Spironolactone
  3. Chlorthalidone
  4. Mannitol
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Correct answer: Chlorthalidone

Chlorthalidone, a thiazide-like diuretic, inhibits the Na⁺/Cl⁻ cotransporter in the distal convoluted tubule, promoting natriuresis and lowering BP.

Difficulty: Medium Question 4 of 20

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