Diuretics, or water pills, help your kidneys put extra salt and water into your urine or pee. This is how diuretics clear extra fluid out and bring down your blood pressure. Diuretics also help when you have too much fluid collecting because of heart failure or other medical problems.
Diuretics are medicines that help reduce fluid buildup in the body. They are sometimes called water pills. Most diuretics help the kidneys remove salt and water through the urine. This lowers the amount of fluid flowing through the veins and arteries.