Drug Classes and Mechanisms · USMLE Step 1

Which mechanism is employed by thiazide diuretics to lower blood pressure?

  1. Inhibiting carbonic anhydrase in PCT
  2. Blocking Na⁺/K⁺/2Cl⁻ cotransporter in loop of Henle
  3. Inhibiting Na⁺/Cl⁻ cotransporter in distal convoluted tubule
  4. Blocking ENaC in collecting duct
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Correct answer: Inhibiting Na⁺/Cl⁻ cotransporter in distal convoluted tubule

Thiazide diuretics inhibit the Na⁺/Cl⁻ cotransporter in the distal convoluted tubule, promoting sodium and water excretion and thereby lowering blood pressure.

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