How does spironolactone (Aldactone) treat high blood pressure and edema?

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Spironolactone (Aldactone) is a potassium-sparing diuretic, also known as a "water pill." This medication helps your body remove excess water and keeps your body from absorbing too much salt. This helps prevent potassium levels from falling too low. Regulating these substances can help blood vessels function normally by allowing blood to flow properly, reducing high blood pressure.