Both potassium and magnesium are electrolyte minerals, meaning they are required for conduction of electrical impulses in the body along with sodium, calcium and chloride. (Gennari,NEJMed;1988,339:451-458).

Magnesium and potassium are the 2 major intracellular cations. The intracellular concentrations of these 2 ions appear to be closely correlated, but the existence of a relationship between the plasma concentrations of these ions has been controversial. They replace the electrolytes you lose because of the water pills.

Potassium and magnesium are extremely important minerals / electrolytes that can be lost in the course of the day in perspiration, urine and other bodily fluids. Potassium and magnesium are plentiful in fruits, vegetables, nuts, seeds and whole grains. Certain food substances, such as those containing caffeine, act as mild diuretics and can also increase the amount of … Potassium is critical for muscle contraction, the heart muscle in particular.

Regardless of the cause, the ability to correct potassium deficiency is impaired when magnesium deficiency is present, particularly when the serum magnesium concentration is less than 0.5 mmol/L (1.2 mg/dL) Magnesium repletion improves the coexistent potassium deficit. Potassium and magnesium are often prescribed to heart patients taking diuretics, or ''water pills.'' Malabsorption, diarrhea, vomiting, excessive sweating, excessive sodium intake and use of certain medications may result in low potassium or magnesium levels.