Diuretics, or water pills, can help your body shed excess fluid through your kidneys. This class of medications are typically prescribed to treat high blood pressure, fluid buildup within the body due to heart failure, fluid buildup in the abdomen because of liver damage, or the eye condition glaucoma.  Some other reasons your doctor may prescribe water pills is polycystic ovarian syndrome, kidney stones, diabetes insipidus and osteoporosis.