Praxis Medical Insights

Est. 2024 • Clinical Guidelines Distilled

Made possible by volunteer editors from the University of Calgary & University of Alberta

Last Updated: 6/14/2025

Management of Hyperacidity

Introduction to Antacids

  • Alginate-based antacids are the best gel option for hyperacidity before and after meals, as they form a protective barrier that floats on top of stomach contents to prevent reflux and neutralize acid, according to the American Gastroenterological Association 1
  • The American Gastroenterological Association recommends taking alginate-based antacids 30 minutes before meals and as needed after meals for optimal effectiveness in patients with hyperacidity, particularly those with post-prandial symptoms and hiatal hernia 1

Mechanism and Benefits of Antacids

  • Alginate-based antacids create a physical barrier that floats on top of stomach contents, providing benefits for post-prandial symptoms and in patients with hiatal hernia, with a strength of evidence based on clinical trials 1
  • The use of H2 Receptor Antagonists, such as famotidine and ranitidine, can complement antacid gels for breakthrough or nighttime symptoms, with an onset within 1 hour and duration of 10-12 hours, although they may develop tachyphylaxis over time, as suggested by the American College of Gastroenterology 1

Patient Considerations

  • For patients with diabetes or obesity, the use of Gelesis100, a hydrogel, may help with weight management but has limited evidence for acid control, according to the American Diabetes Association and the American Gastroenterological Association 2, 3
  • Patients with renal impairment should avoid calcium carbonate and sodium bicarbonate due to potential metabolic side effects, as recommended by the National Kidney Foundation 2, 3

Administration and Timing

  • Taking antacids too soon or too late relative to meals reduces effectiveness, highlighting the importance of proper timing, as emphasized by the American College of Gastroenterology 1
  • Liquid formulations are superior to tablets, particularly in the postprandial period, as they maintain pH above 3.5 significantly longer than tablet forms after meals, according to the American Gastroenterological Association 1