Generic name
Omeprazole: adverse event reports filed with FDA
61,176 reports list it as a suspect or interacting product, 2004–2026. Class: Proton pump inhibitor. Also reported as Omeprazole Delayed-Release Capsules Usp, Omeprazole /00661202/, Omeprazole Delayed Release Capsules 20mg.
- 61,176
- reports as suspect product
- 0.3% of all reports · about 2,720 a year
- 2,506
- reports, 12 months to June 2026
- 2,482 in the 12 months before
- 89.4%
- marked serious by the reporter
- 86.4% across the class
- 9.8%
- record death among outcomes, as reported
- 5,988 reports · not verified by FDA
Between January 2004 and June 2026, 61,176 adverse event reports received by FDA list omeprazole, a generic name as a suspect or interacting product. Reports that mention it only as a concomitant medication (284,875) are left out of every figure here.
In the 12 months to June 2026, 2,506 reports listed it, close to the 2,482 of the 12 months before. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases. Over its reporting history that is about 2,720 reports a year and 0.3% of the 20,646,523 reports in the database, and 12.6% of the reports for the proton pump inhibitor class. How many people take it is not in the data, so a count is not a rate of occurrence.
Reporters most often recorded chronic kidney disease (21.6%), acute kidney injury (13%) and renal failure (7.9%). A report can list several reactions, so shares add to more than 100%; 3,658 different terms appear across these reports. Chronic kidney disease is recorded in 21.6% of these reports, a smaller share than in the median proton pump inhibitor drug (31.6%).
89.4% of the reports are marked serious by the reporter (86.4% across the class); 9.8% record death among the outcomes and 33.6% record hospitalisation, as reported. 28.8% of the reports came from other health professionals, and the largest patient age group is 45 to 64 (23.3%). FDA states that "a causal relationship cannot be established between product and reactions listed in a report" and that for any given report "there is no certainty that a suspected drug caused the event."
Reports by month, five years
Reports by the month FDA received them. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases.
By year received
2026 covers reports received through June 2026 only.
Reactions recorded in the reports
share of Omeprazole reports recording the termmedian drug in proton pump inhibitor
- Chronic kidney diseaselong-term kidney disease21.6%13,186
- Acute kidney injurysudden loss of kidney function13%7,982
- Renal failurekidney failure7.9%4,818
- Drug interactionan interaction between medicines6.2%3,776
- End stage renal diseasekidney failure needing dialysis or transplant5.9%3,601
- Drug ineffectivethe medicine did not work as expected5.7%3,516
- Renal injury4.5%2,766
- Gastrooesophageal reflux diseaseacid reflux4.4%2,665
- Nauseafeeling sick3.9%2,414
- Diarrhoealoose or frequent stools3.9%2,363
- Hypomagnesaemialow blood magnesium3.7%2,256
- Tubulointerstitial nephritis3.6%2,229
- Dyspnoeashortness of breath3.6%2,227
- Off label useused for a purpose or in a way not on the label3.4%2,109
- Vomitingbeing sick3.4%2,059
- Hyponatraemialow blood sodium3.1%1,910
- Fatiguetiredness3.1%1,893
- Painpain, site not specified2.9%1,803
- Falla fall2.9%1,768
- Dizzinesslight-headedness or unsteadiness2.8%1,712
- Headachehead pain2.7%1,672
- Toxicity to various agentspoisoning or toxic effect of one or more substances2.6%1,620
- Malaisegeneral feeling of being unwell2.6%1,595
- Confusional stateconfusion2.4%1,471
- Renal impairmentreduced kidney function2.4%1,454
- Hypotensionlow blood pressure2.3%1,417
- Hypocalcaemialow blood calcium2.2%1,353
- Abdominal pain upperupper stomach pain2.2%1,328
- Condition aggravatedthe condition being treated got worse2.2%1,319
- Deaththe patient died; cause not stated by this term2.2%1,318
Top 30 of 3,658 MedDRA preferred terms recorded across these reports, with a plain-language gloss where one is available. One report can record several terms. The hollow bar is the median share across the 22 drugs in the proton pump inhibitor class; it describes the reports, not the patients. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic."
Outcomes recorded
Outcome flags as the reporter set them; a report can carry several, and "other serious" is FDA's own category for serious reports outside the named outcomes. Grey bar: all 484,090 reports in the class. FDA has not verified any outcome and states that the reports "cannot be used to estimate the incidence of these events."
Patients and reporters
Patient age
Patient sex
Who reported
Age and sex as stated in the report; the reporter's qualification is the primary source recorded by FDA. 47.1% of reports give the United States as the country of the event or reporter.
Reason for use recorded
| Indication as recorded (MedDRA) | Reports | Share |
|---|---|---|
| Gastrooesophageal reflux disease | 14,416 | 23.6% |
| Dyspepsia | 2,435 | 4% |
| Prophylaxis | 1,014 | 1.7% |
| Prophylaxis against gastrointestinal ulcer | 836 | 1.4% |
| Gastritis | 817 | 1.3% |
| Duodenal ulcer | 537 | 0.9% |
The indication field is filled in by the reporter and is often blank; shares are of all 61,176 reports.
Drugs most often listed in the same reports
| Drug (any role in the report) | Reports | Share of Omeprazole reports |
|---|---|---|
| Nexium | 12,977 | 21.2% |
| Prevacid | 11,398 | 18.6% |
| Prilosec | 9,697 | 15.9% |
| Pantoprazole sodium | 9,484 | 15.5% |
| Pantoprazole | 8,111 | 13.3% |
| Nexium 24HR | 7,665 | 12.5% |
| Prevacid 24 HR | 7,387 | 12.1% |
| Furosemide | 6,424 | 10.5% |
| Aspirin | 5,793 | 9.5% |
| Dexilant | 5,453 | 8.9% |
Other products listed in reports where Omeprazole is a suspect product, whatever their own role. Co-listing means the two were recorded together; it says nothing about either product's part in the event. Only the 2,500 most-reported names are counted here.
In context
| Measure | Omeprazole | Proton pump inhibitor | All reports |
|---|---|---|---|
| Reports as suspect product | 61,176 | 484,090 | 20,646,523 |
| Share of that pool | — | 12.6% | 0.3% |
| Reports, latest 12 months | 2,506 | — | 1,332,454 |
| Marked serious | 89.4% | 86.4% | 57.4% |
| Death recorded among outcomes, per 1,000 reports | 98 | 105 | 91 |
| Hospitalisation recorded, per 1,000 reports | 336 | 199 | 213 |
| Consumer-filed share | 24.3% | 26.2% | 45.8% |
| Top term, share of reports | Chronic kidney disease 21.6% | median 31.6% | 0.4% |
Shares are of reports, not of patients treated. The number of people taking a product is not in the data, so none of these figures is a rate, and differences between columns reflect who takes a product, who reports and how long it has been sold. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic."
Other drugs in the proton pump inhibitor class
| Drug | Name type | Reports | Latest 12 months | Marked serious |
|---|---|---|---|---|
| Nexium | brand | 85,367 | 576 | 68.6% |
| Pantoprazole | generic | 44,980 | 2,710 | 95.2% |
| Pantoprazole sodium | generic | 44,098 | 1,629 | 90.9% |
| Prilosec | brand | 42,343 | 115 | 88.3% |
| Prevacid | brand | 40,151 | 273 | 95.8% |
| Nexium 24HR | brand | 27,753 | 300 | 85.1% |
| Lansoprazole | generic | 26,570 | 1,749 | 94.8% |
| Prilosec OTC | brand | 24,549 | 119 | 78.4% |
| Dexilant | brand | 23,621 | 233 | 91.5% |
| Prevacid 24 HR | brand | 20,136 | 13 | 92.6% |
| Esomeprazole | generic | 17,193 | 1,293 | 96.8% |
| Aciphex | brand | 7,246 | 3 | 92.1% |
| Esomeprazole magnesium | generic | 5,014 | 368 | 82.5% |
| Omeprazole magnesium | generic | 4,120 | 175 | 74.9% |
| Rabeprazole | generic | 2,693 | 180 | 90.8% |
Ordered by report count for navigation only. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic." A brand and its generic are separate rows because reporters name them separately.
Questions about Omeprazole reports
How many adverse event reports has FDA received for Omeprazole?
61,176 reports list Omeprazole as a suspect or interacting product in the openFDA FAERS release of 28 Sep 2026, covering reports received through June 2026. 2,506 of them arrived in the latest 12 months. Another 284,875 list it only as a concomitant medication.
What reactions are recorded in Omeprazole reports?
chronic kidney disease (21.6%), acute kidney injury (13%), renal failure (7.9%), drug interaction (6.2%) and end stage renal disease (5.9%). These are MedDRA preferred terms coded from what the reporter described; a report can list several, and a term's presence is not a finding that Omeprazole was responsible.
How serious are the reports?
89.4% are marked serious by the reporter. Among the outcomes recorded, 9.8% of reports include death and 33.6% include hospitalisation. FDA has not verified these outcomes and states that the reports "cannot be used to estimate the incidence" of the events.
Who files these reports?
other health professional (28.8%), consumer or non-health professional (24.3%) and physician (19.2%). Most reports reach FDA through the manufacturer, which must forward reports it receives.
Are reports for Omeprazole rising?
2,506 reports in the 12 months to June 2026, close to the 2,482 of the 12 months before. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases. Counts also move with how many people take a product, its time on the market and publicity.
Do these reports show that Omeprazole was responsible for these reactions?
No. FDA states that "a causal relationship cannot be established between product and reactions listed in a report" and that for any given report "there is no certainty that a suspected drug caused the event." The reaction may relate to the condition being treated, to other medicines, or to something else.
Is this a list of the side effects of Omeprazole?
No. It is a count of what was reported to FDA. The adverse reactions observed in clinical studies are printed on the FDA-approved label, which a pharmacist or clinician can go through with you.
How do I report an adverse event?
Consumers and health professionals can report to FDA through MedWatch (Form FDA 3500 online, or 1-800-FDA-1088), or to the manufacturer, which must pass reports on. See the guide on how to report.
Where this comes from. Counts are built from the openFDA Drug Adverse Event (FAERS) bulk export released 28 Sep 2026, which holds reports FDA received through 30 Jun 2026. Drug names are as reported, resolved to the brand or generic name on the FDA label where openFDA's harmonisation matched them; classes are the pharmacologic class (EPC) from the label and the National Drug Code Directory of 17 Sep 2026. A report counts here when it lists Omeprazole as a suspect or interacting product; reports listing it only as a concomitant medication (284,875) are excluded. No report narrative, lot number, patient detail or reporter identity is published. See the methodology and sources; FDA's record is authoritative, and corrections are handled within five working days.
Drug data (FAERS) through 30 Jun 2026; device data (MAUDE) through 31 Aug 2026. Not medical advice.