Let's take a minute to talk about your medication. This is potassium chloride, and you should take each dose with food and a full glass of water. This is an 'extended-release' capsule, so make sure you do not crush or chew it. If you ever have problems swallowing the capsule whole, your pharmacist can advise you on an alternative. Potassium is used to prevent or treat low potassium levels. Normal potassium levels are necessary for your body to work correctly, especially your heart. Most patients tolerate potassium well. Still, some side effects can occur, like mild stomach upset, nausea or diarrhea, and taking it with food should help. But, if these or other side effects become reasons you want to stop taking this medication, please talk to your doctor or pharmacist. It is important to call your doctor right away if you ever have stomach pain that is severe, or if your bowel movements look like black tar. For best results, continue taking potassium as directed, and follow your doctor's orders for lab tests to make sure this dose remains correct for you.