Spironolactone is a medication primarily used as a diuretic, which helps the body eliminate excess fluid. It works by blocking the action of a hormone called aldosterone, leading to increased urine production and reduced blood pressure. This makes it useful for treating conditions like high blood pressure, heart failure, and certain types of edema. Additionally, spironolactone is often prescribed for hormonal issues, such as polycystic ovary syndrome (PCOS) and acne, due to its ability to reduce androgen levels. It is important to use this medication under a doctor's supervision, as it can have side effects and interact with other drugs.