Praxis Medical Insights

Est. 2024 • Clinical Guidelines Distilled

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

Last Updated: 9/4/2025

Iron Supplementation and Sucralfate Interaction

  • The American Gastroenterological Association recommends taking iron supplements on an empty stomach when possible, and with 500 mg vitamin C (ascorbic acid) to improve absorption, as evidenced by studies published in Clinical Gastroenterology and Hepatology 1, 2
  • To optimize iron absorption, it is advised to avoid taking iron supplements with tea or coffee, which inhibit iron absorption, and to wait at least 1 hour after iron before consuming these beverages, according to Clinical Gastroenterology and Hepatology 1

Optimizing Iron Supplementation

  • Common side effects of oral iron include constipation (12%), diarrhea (8%), and nausea (11%), as reported in Clinical Gastroenterology and Hepatology 1
  • Monitoring for improvement in hemoglobin levels is crucial, with expected increases of 1 g/dL within 2 weeks of proper supplementation, as stated in Clinical Gastroenterology and Hepatology 1

Common Pitfalls to Avoid

  • The Obesity Society advises against taking iron with calcium-containing foods or supplements, recommending a separation of 1-2 hours, as published in Obesity Reviews 3
  • Clinical Gastroenterology and Hepatology recommends avoiding taking iron with high-fiber foods that can decrease absorption 1
  • It is also important to avoid assuming more frequent dosing improves iron levels, as it actually decreases absorption while increasing side effects, according to Clinical Gastroenterology and Hepatology 1