Found white oblong pill with markings kc m10 in my kids tylenol bottle. What is this?

Not medical advice: White oblong pill with imprint KC M10 is 10 mEq Klor-con (potassium chloride), a potassium supplement to treat hypokalemia (low potassium).
Updated on Wednesday, February 01 2012 at 08:53PM EST
Collections: hypokalemiapotassium chloridefoundmarking