Potassium Monitoring with Diuretics

Loop and thiazide diuretics increase potassium excretion in the urine, which can cause hypokalemia, defined as a serum potassium level below 3.5 milliequivalents per liter. Hypokalemia is dangerous because it can cause muscle weakness, cardiac arrhythmias, and in severe cases cardiac arrest. Patients taking these diuretics need regular potassium blood tests and may require potassium supplements or a potassium-rich diet including bananas, oranges, and potatoes. Combining a thiazide or loop diuretic with a potassium-sparing diuretic like spironolactone can help maintain normal potassium levels.