Diuretics
Start with the big picture
Thiazide, loop, and potassium-sparing diuretics are routinely used to treat hypertension; osmotic diuretics such as mannitol are not used for chronic blood pressure control. Thiazides act in the distal convoluted tubule and are first-line options for uncomplicated hypertension. Loop diuretics act in the thick ascending limb and are favored in certain patients with reduced kidney function or heart-failure edema. Potassium-sparing agents act in the collecting duct and may be used as add-on therapy. These classes differ in effects on potassium and calcium, as well as risks such as electrolyte disturbances, gout, ototoxicity, and gynecomastia. The lesson also highlights contraindications, drug interactions, and practical monitoring, while clarifying that chronic blood-pressure reduction reflects reduced peripheral vascular resistance rather than ongoing volume depletion.
What you'll learn
- Explain the early and chronic mechanisms by which diuretics lower blood pressure.
- Distinguish the sites and mechanisms of action of thiazide, loop, and potassium-sparing diuretics.
- Relate diuretic classes to their roles in hypertension and relevant clinical circumstances.
- Identify key adverse effects, contraindications, and drug interactions.
- Describe monitoring considerations for patients receiving diuretic therapy.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
