Spironolactone

A prescription potassium-sparing diuretic used to treat conditions including edema, high blood pressure, and heart failure.

Medication

What it is

Spironolactone is a potassium-sparing diuretic (water pill) prescribed for conditions such as edema, hypertension, and heart failure. Unlike some other diuretics, it works in a way that causes the body to retain potassium rather than lose it, which is the basis for its interaction with potassium supplements.

Known interaction categories

  • Insufficient evidence
  • Avoid combining
  • Use caution

Published interaction pages on this site

Sources

Last reviewed 2026-08-22

Medical information disclaimer: this information is general and educational. It does not diagnose conditions, prescribe treatment, or determine whether a combination is safe for you personally. Follow your prescription label and ask a pharmacist or clinician before starting, stopping, or combining products. Full disclaimer.