Potassium-Sparing Diuretics

Potassium-Sparing Diuretics are cardiovascular medicines in the antihypertensive family. This group includes Spironolactone (Aldactone), Eplerenone (Inspra), Amiloride, and Triamterene. They are generally used in the context of blood-pressure treatment.

This page is an educational reference for considering what may interact with these medicines, including other products you may be taking. A clinician can help assess interactions in the context of any medical condition or treatment.

Potassium is the most important interaction concern. Potassium-sparing diuretics directly reduce renal potassium excretion, so combining them with potassium supplements can cause severe hyperkalemia, with a high risk of cardiac arrest. High-dose Iodine preparations, including potassium iodide, may also contribute to hyperkalemia, particularly when renal or adrenal impairment is present. Beetroot Extract and Sea Moss (Irish Moss) contain potassium and may further increase this risk, especially with reduced kidney function.

Aloe Vera latex can cause potassium depletion through its laxative effect, while potassium-sparing diuretics retain potassium. These opposing effects can make potassium balance unpredictable and may mask developing hypokalemia. Sodium Bicarbonate can shift potassium into cells through bicarbonate-induced metabolic alkalosis, creating a complex interaction that may affect serum potassium monitoring and management.

Magnesium is mainly a concern when kidney function is impaired or magnesium intake is excessive, because clearance may be reduced and hypermagnesemia can develop. With normal renal function, concurrent use is generally considered safe, although monitoring may be appropriate when renal clearance is impaired.

Saw Palmetto presents a theoretical concern specifically with spironolactone: overlapping anti-androgen effects could potentially increase hormonal effects such as gynecomastia or sexual dysfunction. Vitamin B9 (Folate) has a different interaction involving triamterene, which can impair folate utilization and occasionally contribute to megaloblastic anemia in people who are folate-depleted.

Anyone using these combinations, particularly with kidney or adrenal conditions, can discuss the relevant supplement and monitoring needs with a prescriber or pharmacist.