Thiazide Diuretics · Pharmacology

Metolazone is unique among thiazide-type diuretics because it:

  1. Can be given intravenously and acts far faster than oral thiazides
  2. Retains efficacy in patients with impaired renal function
  3. Has no effect on serum potassium concentrations
  4. Is used primarily to treat open-angle glaucoma
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Correct answer: Retains efficacy in patients with impaired renal function

Most thiazides lose efficacy when GFR is low, but metolazone remains effective in patients with advanced renal insufficiency. It is often used in combination with loop diuretics to overcome diuretic resistance.

Difficulty: Medium Question 17 of 20

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