what kind of pill has KC M10 written on it?

Not Medical Advice: A white, oval-shaped pill (also referred to as elliptical-shaped) imprinted with KC M10 is potassium chloride 10 mEq (i.e., KCl 10 mEq), manufactured under the brand name Klor-Con m10. A minerals and electrolytes medication, it is used for treating hypokalemia - i.e., low potassium levels in the blood. It is not a controlled substance.

Common side effects of potassium chloride include nausea, vomiting, gas, diarrhea, and stomach discomfort. These are not generally serious, but if you have persistent symptoms of any of these, you should consult a physician.

Severe side effects of potassium chloride may include: rash; difficulty breathing; chest tightness; swelling of lips/tongue/face/mouth; itching; hives; black & tarry stools; irregular heartbeat; chest pain; tingling or numbness of lips, skin, feet, or hands; listlessness; severe vomiting or nausea; leg heaviness or weakness; swelling or pain in stomach; unusual muscle paralysis or weakness; vomit with an appearance of coffee grounds; or unusual anxiety or confusion. If you experience any of these severe side effects, please seek medical attention immediately.

In a retrospective of recent food and drink-related deaths published by Fox News online on August 22nd, 2012, one of the seven tragedies mentioned was the April 2012 death of New Zealand mother of eight Natasha Harris, a 30-year-old who drank up to 10 liters of Coca-Cola daily.

The pathologist on the case testified in court that Harris died of cardiac arrhythmia and was believed to have developed severe hypokalemia as a result of her excessive Coke consumption. Doctors believed that the severe hypokalemia, coupled with poor nutrition and excessive caffeine consumption, contributed to the cardiac arrest and, ultimately, her death.