Long-term use of omeprazole
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Long-Term Omeprazole Use: Efficacy and Safety in Acid-Related Disorders
Omeprazole, a proton pump inhibitor (PPI), is widely used for managing acid-related gastrointestinal conditions, especially in patients with severe or refractory reflux esophagitis. Long-term studies show that omeprazole is highly effective in maintaining remission and healing esophagitis, even in patients who do not respond to other treatments. Most patients remain symptom-free with maintenance therapy, and relapses can usually be controlled by increasing the dose. No progression of Barrett’s esophagus or development of peptic strictures was observed during long-term use, and the drug is considered safe and effective for up to 11 years of continuous therapy in these populations Klinkenberg‐Knol1994Klinkenberg‐Knol2000.
Adverse Effects and Biochemical Changes with Prolonged Omeprazole Use
Hematological and Biochemical Disturbances
Long-term omeprazole use is associated with several changes in blood and biochemical parameters. Patients on omeprazole for a year or more may experience significant reductions in red blood cell counts and indices, leading to anemia. There are also increases in cholesterol, triglycerides, low-density lipoprotein (LDL), and certain liver enzymes (alkaline phosphatase and aspartate aminotransferase), as well as elevated creatinine and blood urea nitrogen, indicating possible effects on liver and kidney function. Additionally, long-term users often have lower levels of serum ferritin, vitamin D3, and calcium, suggesting impaired absorption of these nutrients Ali2022Elfarrah2025Lam2022+1 MORE.
Electrolyte Imbalances
Rare but serious electrolyte disturbances, such as hypomagnesemia, hypocalcemia, and hypokalemia, have been reported in patients on long-term omeprazole therapy. These imbalances can be resistant to supplementation until the PPI is discontinued, highlighting the importance of monitoring electrolytes in chronic users .
Cognitive and Neurological Effects
Several studies suggest that long-term omeprazole use may negatively affect cognitive function. Users have shown impairments in executive function, memory, attention, and verbal fluency compared to non-users. The degree of cognitive impairment appears to be related to the duration of omeprazole use. These effects may be linked to increased oxidative stress and changes in antioxidant enzyme activity, as well as possible vitamin B12 deficiency Dries2021Haefliger2022Coelho2024.
Gastric Mucosal Changes and Infection Risk
Long-term omeprazole therapy can lead to changes in the gastric mucosa, including an increased risk of atrophic gastritis, especially in patients with pre-existing moderate or severe gastritis. However, the risk of developing intestinal metaplasia, dysplasia, or neoplasms remains low. There is also a positive correlation between long-term omeprazole use and urinary tract infections, as well as a high prevalence of vitamin D deficiency among users Elfarrah2025Klinkenberg‐Knol2000.
Renal Effects
Animal studies indicate that chronic omeprazole use can cause kidney injury, including increased urea, creatinine, and proteinuria, as well as histological changes such as inflammation, fibrosis, and cellular degeneration. These effects are thought to be mediated by inflammation and oxidative stress .
Overall Safety Profile
Large-scale safety reviews show that the adverse event profile of omeprazole during long-term use is similar to that seen with short-term use and comparable to other acid-suppressing drugs like ranitidine and cimetidine. Most adverse events are mild, and the rate of occurrence tends to decrease over time. No new or unexpected adverse events have been identified with long-term therapy, and serious adverse events causally related to omeprazole are rare Joelson1992Klinkenberg‐Knol2000.
Conclusion
Long-term omeprazole therapy is effective and generally well tolerated for managing severe acid-related disorders. However, prolonged use can lead to hematological, biochemical, cognitive, and renal changes, as well as nutrient deficiencies and rare but serious electrolyte disturbances. Regular monitoring of blood counts, kidney and liver function, electrolytes, and nutrient levels is recommended for patients on chronic omeprazole therapy. Deprescribing should be considered when possible to minimize risks, especially in patients without a clear ongoing indication for therapy.
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