Severe Electrolyte Disturbances Due to Proton Pump Inhibitor Therapy: An Underrecognized Problem with Potentially Severe Sequelae

Objective: Unusual clinical course Background: Proton pump inhibitors are increasingly being recognized as a cause of multiple electrolyte disturbances, including hypomagnesemia, hypocalcemia, hypophosphatasemia, hypokalemia and hyponatremia, particularly in persons on long-term therapy. The mechanisms, consequences, and management of these electrolyte disturbances are discussed below. Case Report: A 55-year-old woman was seen by various clinicians, with a variety of clinical presentations, over the space of a couple of years. During each visit, she had electrolyte disturbances and was on proton pump inhibitor thera-py, which were either continued or changed to a different proton pump inhibitor. She had presented variously with diarrhea and weight loss due to microscopic colitis, confusion, and grand mal seizures on separate occa-sions. Changing the proton pump inhibitor did not alleviate her profound electrolyte disturbances, which com-pletely resolved shortly after stopping drug therapy. Conclusions: It is important for clinicians to be aware of the electrolyte disturbances that can be caused by these medica-tions, and to actively monitor patients on long-term therapy for these disturbances, thus avoiding potentially severe consequences. Electrolyte disturbances are more likely to arise in patients who are prescribed concomitant diuretic treatment or who overuse alcohol. The incidental finding of hypocalcemia in persons on proton pump inhibitors may be secondary to hypomagnesemia, and hypomagnesemia may be a consequence of an underlying otherwise symptomless genetic disorders. Clinicians should be encouraged to deprescribe these drugs after 4 weeks of treatment in patients with mild symptoms or mild disease.