Potassium Supplement Side Effects
Potassium supplements most commonly cause gastrointestinal (GI) side effects. (medlineplus.gov) The most serious potential adverse effect is hyperkalemia, which can cause life-threatening cardiac rhythm abnormalities. (ods.od.nih.gov)
Common Gastrointestinal Side Effects
- Nausea. (medlineplus.gov)
- Vomiting. (medlineplus.gov)
- Abdominal discomfort or pain. (medlineplus.gov)
- Diarrhea. (medlineplus.gov)
Hyperkalemia-Related Adverse Effects
Hyperkalemia can develop especially with kidney disease or with conditions/medications that impair potassium excretion. (ods.od.nih.gov)
- Muscle weakness. (fda.gov)
- Numbness or tingling. (mayoclinic.org)
- Irregular heartbeat or other symptoms suggesting arrhythmia. (mayoclinic.org)
- Potential severe cardiovascular effects, including cardiac dysrhythmias and death in cases of severe overdose. (fda.gov)
Serious Risks From Some Oral Potassium Products
Some potassium chloride oral drug products have been associated with small-bowel lesions, leading to FDA labeling requirements for certain formulations. (ods.od.nih.gov)
When Adverse Effects Are Most Likely
Adverse effects are more likely when potassium is not tolerated due to reduced kidney excretion or when potassium supplements are combined with risk factors for elevated serum potassium. (ods.od.nih.gov)
Action for Concerning Symptoms
Clinically urgent evaluation is warranted for symptoms consistent with hyperkalemia, including weakness, irregular heartbeat, severe GI symptoms, or signs of a possible allergic reaction. (mayoclinic.org)