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Potassium is an electrolyte your body needs to function properly. Many diuretics (water pills) cause people to lose potassium along with urine. For that reason, some people who take a diuretic need a potassium supplement.
Note that some heart failure patients who have kidney problems, or who are taking an aldosterone antagonist, or an ACE inhibitor along with their regular diuretic may not need extra potassium.
Remember that some salt substitutes contain potassium.
If you are taking a potassium supplement, you should have your blood checked regularly to make sure your potassium level is normal.