Potassium is essential for the proper functioning of the heart, kidneys, muscles, nerves, and digestive system. Usually the food you eat supplies all of the potassium you need. However, certain diseases (e.g., kidney dis...

Your doctor has ordered total parenteral nutrition (TPN) for you. TPN will drip through a needle or catheter placed in your vein for 10-12 hours, once a day or five times a week.

Sodium phosphate is used to completely empty the colon (large intestine, bowel) before a colonoscopy (examination of the inside of the colon to check for colon cancer and other abnormalities) so that the doctor will have...