Thiazide Diuretics · Pharmacology

Thiazide diuretics are often used as first-line therapy for hypertension because they:

  1. Directly inhibit the renin-angiotensin-aldosterone system
  2. Provide long-term reduction in peripheral vascular resistance
  3. Block aldosterone receptors in the distal tubule and collecting duct
  4. Have a rapid onset of action within a few minutes of dosing
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Correct answer: Provide long-term reduction in peripheral vascular resistance

While their initial effect is due to decreased blood volume, the long-term antihypertensive effect of thiazides is attributed to a decrease in peripheral vascular resistance, possibly due to changes in sodium content in vessel walls.

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