Medication Names

Potassium: (Kaochlor® 10%, Kaon CL®, Kay Ciel®, K-Lor®, Klotrix®, K-Lyte®, Slow-K®, K-Dur® and others)

Magnesium: (Mag-Ox®, Uro-Mag®)


Why this medication is prescribed

Potassium and magnesium supplements replace these minerals, which can be lost because of increased urination when taking diuretics.

When to take

Take medications right after meals or with food. Follow the label directions on how often to take. The number of doses you take each day, the time allowed between doses, and how long you need to take it will depend on the type of medication prescribed, as well as your condition.

Food and drug interactions

If you are using a salt substitute, tell your doctor or nurse. Many salt substitutes contain potassium. Follow your doctor’s dietary guidelines for including potassium-rich foods in your diet.

Your doctor will consider the other heart failure medications you are taking, such as ACE inhibitors, aldosterone antagonists, and certain diuretics, when determining your potassium dosage.

Side effects and how to manage them

  • Nausea, vomiting, diarrhea, abdominal discomfort: Take the medication with or right after meals with a full glass of water or fruit juice. If these side effects continue, contact your doctor or nurse.
  • If you take controlled-release tablets or capsules and experience severe vomiting (especially blood) and abdominal pain or swelling, stop taking the medication and contact your doctor or nurse right away.
  • Black, tarry or bloody stools (signs of stomach bleeding): Contact your doctor or nurse right away.
  • Confusion (rare); irregular or slow heartbeat; numbness or tingling in hands, feet, or lips shortness of breath or difficult breathing; unexplained anxiety; unusual tiredness or weakness: Contact your doctor or nurse right away.

Please obtain blood work as prescribed by your doctor or nurse to check for potassium and other minerals in your blood.


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This information is provided by the Cleveland Clinic and is not intended to replace the medical advice of your doctor or health care provider. Please consult your health care provider for advice about a specific medical condition. This document was last reviewed on: 9/1/2010...#12883