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Canadian Pharmacist Qualifying Exam Practice · Question

A 60-year-old male with a history of heart failure (NYHA Class III) is prescribed furosemide 40 mg daily. Furosemide acts by inhibiting the Na-K-2Cl cotransporter in the thick ascending limb of the loop of Henle. This mechanism classifies furosemide as which type of drug?

Drugs that inhibit the Na-K-2Cl cotransporter in the thick ascending limb of the loop of Henle are classified as loop diuretics. Furosemide is a potent loop diu

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Question: A 60-year-old male with a history of heart failure (NYHA Class III) is prescribed furosemide 40 mg daily. Furosemide acts by inhibiting the Na-K-2Cl cotransporter in the thick ascending limb of the loop of Henle. This mechanism classifies furosemide as which type of drug?

Answer options:

  • Thiazide diuretic
  • Potassium-sparing diuretic ✅ Loop diuretic
  • Carbonic anhydrase inhibitor

Correct answer: Loop diuretic

Explanation: Drugs that inhibit the Na-K-2Cl cotransporter in the thick ascending limb of the loop of Henle are classified as loop diuretics. Furosemide is a potent loop diuretic, commonly used in conditions like heart failure.

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