Electrolyte disturbances in children receiving omeprazole for gastroesophageal reflux disease

Background: Gastroesophageal reflux disease (GERD) is one of the common gastrointestinal diseases with various side effects. Proton pump inhibitor (PPI) drugs are widely used for their treatment and long‑term ingestion, which results in an electrolyte imbalance. This study investigates the changes in serum magnesium, calcium, sodium, and potassium after long‑term use of omeprazole in children. Materials and Methods: This cross‑sectional study was conducted in 2016–2017 on 97 children and adolescents, aged 1–15 years, with GERD, in Isfahan, Iran. Enrolled were patients visiting a referral pediatric gastroenterology clinic (Imam Hossein and Amin Hospitals) examined by an academic pediatric gastroenterologist. Before and 4 weeks after omeprazole administration, clinical manifestations including lethargy, muscle spasm, dyspnea, nausea, vomiting, abnormal heartbeat and deep tendon reflexes, and Chvostek and Trousseau signs were recorded in a data‑gathering form. In addition, fasting serum magnesium, calcium, sodium, and potassium were measured. Results: The McNemar test results showed that omeprazole can reduce sodium, calcium, and magnesium levels statistically significantly (P < 0.05), but potassium levels do not have a meaningful reduction (P > 0.05). Conclusion: Consumption of omeprazole might cause asymptomatic hypomagnesemia, hypocalcemia, and hypernatremia in children. Such side effects should be considered in the follow‑up of children under treatment with this medication.