Common uses of potassium include regulating fluid balance, maintaining a healthy blood pressure and controlling the functions of the muscles, such as the electrical activity of the heart, reports Medical News Today. Some people use potassium to prevent stroke and to treat increased calcium levels, allergies and constipation, says WebMD.
Conditions such as diarrhea, vomiting and high blood pressure can lower potassium levels in the body, causing fatigue, weakness and muscle cramps, notes Everyday Health. Patients with kidney disease sometimes retain high levels of potassium in the body, causing irregular heartbeats. Foods high in potassium include bananas, orange juice, dried apricots and honeydew melon. Patients should consult their health care providers on how to monitor potassium levels.