Which medications in the drug class Diuretic, Potassium-Sparing are used in the treatment of Hypertension?

Updated: Feb 22, 2019
  • Author: Matthew R Alexander, MD, PhD; Chief Editor: Eric H Yang, MD  more...
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Diuretic, Potassium-Sparing

The potassium-sparing diuretics interfere with sodium reabsorption at the distal tubules (primarily in the collecting duct region of the nephron), decreasing potassium secretion. Potassium-sparing diuretics have a weak diuretic and antihypertensive effect when used alone.


Triamterene is used alone or with other medications (often a kaliuretic diuretic such as hydrochlorothiazide) to treat edema and high blood pressure. Because triamterene increases potassium levels, caution is required when combining triamterene with ACE inhibitors, angiotensin receptor blockers, aliskiren, and other drugs that increase potassium levels. Potassium level should be monitored at start of treatment, dose change, and during illness that affects renal function. The recommended dose is 100 mg twice daily (maximum dose is 300 mg/d).

Amiloride (Midamor)

Amiloride is a potassium-conserving (antikaliuretic) drug that, compared with thiazide diuretics, possesses weak natriuretic, diuretic, and antihypertensive activity. It is approved as adjunctive treatment with thiazide diuretics or other kaliuretic-diuretic agents for hypertension or congestive heart failure. It is unrelated chemically to other known antikaliuretic or diuretic agents. Amiloride has little additive diuretic or antihypertensive effect when added to a thiazide diuretic. Amiloride can be given at a dose of 5-10 mg daily in 1-2 divided doses for hypertension. Amiloride has a black box warning for hyperkalemia, which, if not corrected, is potentially fatal. This incidence is greater in patients with renal impairment or diabetes mellitus and in the elderly.

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