Omeprazole and Iron: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 2, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Omeprazole
Iron
No brand names on record
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
Here's what's going on if you take omeprazole (like Prilosec) along with an iron supplement. Omeprazole lowers the amount of acid in your stomach, and your body actually needs that acid to absorb iron well. So taking them together can mean you absorb less iron than you otherwise would.
This matters most if you're taking iron to treat or prevent low iron or anemia, because it may work less well. The good news is this is very manageable. Talk with your pharmacist or doctor, they can adjust things and keep an eye on your iron levels so you still get the benefit you need.
Effect: Reduced absorption/bioavailability of iron salts.
Mechanism: Omeprazole causes extensive, long-lasting inhibition of gastric acid secretion. Iron absorption is acid-dependent (ferrous iron solubility and reduction favored by low gastric pH), so decreased intragastric acidity impairs iron uptake. This is a PK interaction; neither agent is activated by the other.
- Direction: Decreased iron effect (reduced absorption).
- Onset: Rapid.
- Evidence: Probable (limited case data).
- Management: Monitor hemoglobin, ferritin, and iron studies; iron dose may need to be individualized/increased, or consider IV iron if oral repletion fails. Separating doses is of limited value given sustained acid suppression.
What happens
Reduced iron salts absorption
Interaction Deep Dive
Because omeprazole lowers the acidity within the stomach, it may diminish how well iron salts are absorbed1. The inhibition of gastric acid secretion caused by omeprazole is both substantial and prolonged. Certain drugs, iron among them, rely on the presence of gastric acid to improve their uptake from the GI tract. In 2 patients who received iron together with omeprazole, the decreased acidity seems to have interfered with iron absorption, resulting in lower bioavailability 32.
Why it happens (mechanism)
Reduced intragastric acidity
How to manage this interaction
Keep taking both medications as prescribed unless your care team tells you otherwise. This interaction is manageable.
- Let your pharmacist and prescriber know you take both omeprazole and an iron supplement.
- Your team may monitor your iron levels and blood counts (such as hemoglobin and ferritin) to make sure the iron is working.
- Your iron dose may need to be adjusted and individualized by your care team, and if oral iron isn't enough, they can discuss other options.
- Raise any ongoing tiredness, weakness, or symptoms of low iron with your provider.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) Taking omeprazole together with iron supplements markedly reduced iron absorption in patients who had iron-deficiency anemia. According to 2 case reports, two women (aged 51 and 83 years) who were diagnosed with iron-deficiency anemia (resulting from hemorrhagic erosive gastritis) received omeprazole (20 milligrams per day in one woman; the dose was not stated for the other) at the same time as oral iron supplementation. Their serum hemoglobin levels showed no improvement during the following 6 months even though iron therapy was maintained. Omeprazole was stopped in both women (in one of them, iron malabsorption was assessed and verified before omeprazole was withdrawn), and afterward both patients showed increases in hemoglobin level and mean corpuscular volume. The authors propose that gastric hypochlorhydria caused by omeprazole substantially diminished non-heme iron absorption 2.
Common questions
Can I take Omeprazole and Iron together?
Omeprazole lowers stomach acid, which can reduce how much iron you absorb, so your iron may work less well. Keep taking both as prescribed and ask your pharmacist or doctor to check your iron levels and adjust your dose if needed. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Omeprazole and Iron interaction?
It is rated moderate. Can be significant — usually manageable with monitoring.
How quickly could this interaction happen?
The documented onset is "rapid". Effects can appear quickly, often within about 24 hours of combining the drugs.
How is the Omeprazole and Iron interaction managed?
Keep taking both medications as prescribed unless your care team tells you otherwise. This interaction is manageable. Let your pharmacist and prescriber know you take both omeprazole and an iron supplement. Your team may monitor your iron levels and blood counts (such as hemoglobin and ferritin) to make sure the iron is working. Your iron dose may need to be adjusted and individualized by your car… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "probable". Good supporting evidence, though not definitively proven.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Omeprazole or Iron need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there anything you'd monitor while I'm on both?
References (3)
- Product Information: KONVOMEP(TM) powder for oral suspension, omeprazole sodium bicarbonate powder for oral suspension. Azurity Pharmaceuticals Inc (per manufacturer), Woburn, MA, 2022. DailyMed
- Sharma VR, Brannon MA, & Carloss EA: Case report: effect of omeprazole on oral iron replacement in patients with iron deficiency anemia. South Med J 2004; 97(9):887-889. PubMed
- Product Information: Prilosec(R), omeprazole. Astra Merck Inc. Wayne, PA, 1995. DailyMed
Keep reading about Omeprazole
Keep reading about Iron
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
Check another combination
Our instant two-drug interaction checker is almost here.
Still have questions about this combination?
Every question gets a real answer from a licensed pharmacist — free, and usually within a day.
Ask the pharmacist