This medication is a mineral supplement used to prevent or treat low amounts of potassium in the blood. A normal level of potassium in the blood is important so that your cells, nerves, heart, muscles, and kidneys work properly. Normal blood levels of potassium are usually achieved by eating a well-balanced diet. However, certain situations cause your body to lose potassium faster than you can replace it from your diet. These situations include treatment with certain “water pills” (diuretics), a poor diet, or certain medical conditions (e.g., severe diarrhea especially with vomiting).

Source: http://www.healthsquare.com/drugs/71804.htm