What are the side effects of potassium?

Based on information from, a free medication monitoring service, 11% of patients experience side effects while taking Potassium. Some of the side effects reported by iGuard members include:

  • Nausea/Vomiting
  • Abdominal Pain/Cramps
Please follow up with your doctor or other healthcare provider if you are experiencing any symptoms that worsen or do not go away.
Most side effects of potassium supplements are mild and do not require medical attention. Serious side effects are uncommon, but require immediate medical attention if they do occur. These include: abdominal pain or cramping; anxiety; breathing problems; chest or throat pain while swallowing; confusion; irregular heartbeat; itchy rash or hives; swelling of the throat and face; numbness in the hands, feet or lips; red- or black-colored bowel movements; and unusual tiredness, especially heaviness or weakness in the legs. The following side effects are more common and less serious; talk to your doctor if they persist or become bothersome: diarrhea, mild stomach discomfort, nausea, vomiting.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.