Prescription
Potassium-sparing diuretic (water pill)
Spironolactone
Last reviewed April 2026
Who is this for?
What is this drug?
Spironolactone is a water pill (diuretic) that helps your body get rid of extra water and salt while keeping potassium levels from dropping too low — it works by blocking a hormone called aldosterone that normally makes your body hold onto salt and water.
What is it used for?
High blood pressureswelling of the body (especially legs and belly) caused by heart failure or liver problemsfluid buildup in the belly from liver diseaselow potassium levelsheart failure
Prescription Required
A doctor's prescription is required to obtain this drug legally.