This page presents data from the FDA Adverse Event Reporting System (FAERS) and the FDA-approved drug label. A report submitted to FAERS does not prove a drug caused the reported event. Always consult a healthcare provider about medications.

Omeprazole (omeprazole magnesium)

Last updated: June 20, 2026

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Omeprazole is the brand name for omeprazole magnesium. According to the FDA-approved label, • treats frequent heartburn (occurs 2 or more days a week) • not intended for immediate relief of heartburn; this drug may take 1 to 4 days for full effect. FAERS contains 438,456 submissions naming this drug from 1989 through 2026; the top three reactions cited are chronic kidney disease, nausea, and fatigue.

Most-Reported Reactions

Counts of the reactions most often cited in FAERS submissions that named Omeprazole. Inclusion here does not establish causation - submitters describe what was observed, not what was confirmed. One submission can list several reactions, so the totals exceed the report count.

Patient Demographics

Patient sex and age across the FAERS submissions that named Omeprazole. Percentages here are computed only from submissions where these fields were filled in - many leave them blank.

By Sex

By Age Group

Severity Outcomes

Severity flags recorded across the 438,456 FAERS submissions that named Omeprazole. Each bar shows the count of those reports carrying that flag. A single case can carry more than one (a hospitalization that became life-threatening, for example), so these bars are independent rates - they don't sum to 100%. Inclusion of a case under any flag does not establish that the drug caused the outcome.

Submissions Per Quarter

Quarterly count of FAERS submissions that named Omeprazole. Ups and downs on this chart can track prescribing volume, news cycles, or shifts in how reports get filed, rather than the drug becoming safer or more dangerous.

From the FDA-Approved Label

Excerpts from the official FDA-approved prescribing information for Omeprazole. This is the authoritative source on indications, warnings, and known adverse reactions.

Indications

• treats frequent heartburn (occurs 2 or more days a week) • not intended for immediate relief of heartburn; this drug may take 1 to 4 days for full effect

Warnings

Allergy alert: • do not use if you are allergic to omeprazole. • Omeprazole may cause severe skin reactions. Symptoms may include: • skin reddening • blisters • rash If an allergic reaction occurs, stop use and seek medical help right away. Do not use if you have: • trouble or pain swallowing food, vomiting with blood, or bloody or black stools • heartburn with lightheadedness, sweating or dizziness • chest pain or shoulder pain with shortness of breath; sweating; pain spreading to arms, neck or shoulders; or lightheadedness • frequent chest pain These may be signs of a serious condition. See your doctor. Ask a doctor before use if you have: • had heartburn over 3 months. This may be a sign of a more serious condition. • frequent wheezing, particularly with heartburn • unexplained weight loss • nausea or vomiting • stomach pain Ask a doctor or pharmacist before use if you are taking a prescription drug. Acid reducers may interact with certain prescription drugs. Stop use and ask a doctor if: • your heartburn continues or worsens • you need to take this product for more than 14 days • you need to take more than 1 course of treatment every 4 months • you get diarrhea • you develop a ...

FDA label effective date: 2024-03-29

Disclaimer

AdverseEvent.ai is not affiliated with the FDA. Adverse-event counts come from the FDA Adverse Event Reporting System (FAERS). Drug labels come from the FDA drug label dataset. A report submitted to FAERS does not prove a drug caused the reported event — always consult a healthcare provider about medications. This site is for informational purposes only and is not medical advice.