Reported Reactions

Drugs › Radiographic contrast agent

Brand name · Iohexol

Omnipaque: adverse event reports filed with FDA

7,562 reports list it as a suspect or interacting product, 2004–2026. Class: Radiographic contrast agent. Also reported as Omnipaque 180, Omnipaque 300, Omnipaque 350.

7,562
reports as suspect product
0% of all reports · about 336 a year
661
reports, 12 months to June 2026
637 in the 12 months before
80.7%
marked serious by the reporter
77% across the class
5.9%
record death among outcomes, as reported
448 reports · not verified by FDA

7,562 adverse event reports received by FDA list the brand name Omnipaque (iohexol) as a suspect or interacting product, from January 2004 to June 2026. A further 809 reports list it only as a concomitant medication, and those are not counted in the figures on this page.

In the 12 months to June 2026, 661 reports listed it, close to the 637 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 336 reports a year and 0% of the 20,646,523 reports in the database, and 28% of the reports for the radiographic contrast agent class. How many people take it is not in the data, so a count is not a rate of occurrence.

The reactions recorded most often are urticaria (13.5%), pruritus (11.7%) and dyspnoea (10%). A report can list several reactions, so shares add to more than 100%; 656 different terms appear across these reports. Urticaria is recorded in 13.5% of these reports, a larger share than in the median radiographic contrast agent drug (7.2%).

80.7% of the reports are marked serious by the reporter (77% across the class); 5.9% record death among the outcomes and 30.2% record hospitalisation, as reported. 66% of the reports came from other health professionals, and the largest patient age group is 45 to 64 (28.1%). 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

04385Jul 2021: 33Aug 2021: 26Sep 2021: 27Oct 2021: 18Nov 2021: 35Dec 2021: 312022Jan 2022: 13Feb 2022: 33Mar 2022: 27Apr 2022: 32May 2022: 33Jun 2022: 30Jul 2022: 32Aug 2022: 31Sep 2022: 28Oct 2022: 25Nov 2022: 36Dec 2022: 272023Jan 2023: 28Feb 2023: 28Mar 2023: 25Apr 2023: 15May 2023: 36Jun 2023: 41Jul 2023: 40Aug 2023: 36Sep 2023: 44Oct 2023: 43Nov 2023: 36Dec 2023: 502024Jan 2024: 32Feb 2024: 22Mar 2024: 61Apr 2024: 26May 2024: 28Jun 2024: 35Jul 2024: 47Aug 2024: 47Sep 2024: 35Oct 2024: 39Nov 2024: 53Dec 2024: 612025Jan 2025: 52Feb 2025: 77Mar 2025: 84Apr 2025: 69May 2025: 24Jun 2025: 49Jul 2025: 69Aug 2025: 52Sep 2025: 43Oct 2025: 45Nov 2025: 33Dec 2025: 512026Jan 2026: 55Feb 2026: 51Mar 2026: 45Apr 2026: 76May 2026: 56Jun 2026: 85

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

03246482004: 11620042005: 812006: 1212007: 9120072008: 952009: 1002010: 10720102011: 1302012: 2082013: 34220132014: 6452015: 5442016: 50120162017: 6062018: 4532019: 39620192020: 4212021: 3342022: 34720222023: 4222024: 4862025: 64820252026: 368

2026 covers reports received through June 2026 only.

Reactions recorded in the reports

share of Omnipaque reports recording the termmedian drug in radiographic contrast agent

  1. Urticariahives13.5%1,019
  2. Pruritusitching11.7%883
  3. Dyspnoeashortness of breath10%757
  4. Sneezing8.1%609
  5. Erythemaskin redness7.6%576
  6. Nauseafeeling sick6.1%463
  7. Vomitingbeing sick5.6%421
  8. Rashskin rash4.9%368
  9. Chillschills or shivering4.5%344
  10. Coughcough3.9%298
  11. Contrast media reaction3.7%279
  12. Anaphylactic reactiona severe, sudden allergic reaction3.4%259
  13. Hypotensionlow blood pressure3.3%247
  14. Chest discomfortchest discomfort3.2%245
  15. Dizzinesslight-headedness or unsteadiness3.2%244
  16. Throat irritationan irritated throat3.2%243
  17. Hypersensitivityan allergic-type reaction3.2%241
  18. Contrast media allergy3.1%235
  19. Pyrexiafever2.7%204
  20. Throat tightnessa tight throat2.7%202
  21. Anaphylactic shocka severe allergic reaction with collapse2.7%201
  22. Blood pressure decreaseda low blood pressure reading2.6%193
  23. Headachehead pain2.5%192
  24. Loss of consciousnesspassing out2.5%188
  25. Acute kidney injurysudden loss of kidney function2.2%169
  26. Extravasation2%152
  27. Dysphagiadifficulty swallowing1.9%140
  28. Malaisegeneral feeling of being unwell1.8%138
  29. Flushingsudden reddening or warmth of the skin1.8%137
  30. Hyperhidrosisexcessive sweating1.7%131

Top 30 of 656 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 11 drugs in the radiographic contrast agent 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

Death5.9%448
Life-threatening12.2%924
Hospitalisation (initial or prolonged)30.2%2,284
Disability1.8%137
Congenital anomaly0%1
Other serious44.7%3,377
Not serious19.3%1,462

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 26,987 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

Under 20.5%40
2 to 110.4%34
12 to 170.9%68
18 to 4416.9%1,275
45 to 6428.1%2,124
65 to 7414%1,056
75 and over11.3%852
Age not given27.9%2,113

Patient sex

Female46.3%3,502
Male33.3%2,519
Not given20.4%1,541

Who reported

Physician20.1%1,521
Pharmacist5.9%449
Other health professional66%4,994
Lawyer0.1%5
Consumer or non-health professional4.4%330
Not given3.5%263

Age and sex as stated in the report; the reporter's qualification is the primary source recorded by FDA. 37% of reports give the United States as the country of the event or reporter.

Reason for use recorded

Indication as recorded (MedDRA)ReportsShare
Diagnostic procedure98213%
Computerised tomogram76110.1%
Computerised tomogram abdomen4856.4%
Abdominal pain1822.4%
Computerised tomogram thorax1792.4%
Scan with contrast941.2%

The indication field is filled in by the reporter and is often blank; shares are of all 7,562 reports.

Drugs most often listed in the same reports

Drug (any role in the report)ReportsShare of Omnipaque reports
Aspirin1111.5%
Metformin1091.4%
Furosemide1051.4%
Sodium chloride891.2%
Kardegic841.1%
Amlodipine700.9%
Atorvastatin700.9%
Acetaminophen630.8%
Pantoprazole620.8%
Lansoprazole590.8%

Other products listed in reports where Omnipaque 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

MeasureOmnipaqueRadiographic contrast agentAll reports
Reports as suspect product7,56226,98720,646,523
Share of that pool—28%0%
Reports, latest 12 months661—1,332,454
Marked serious80.7%77%57.4%
Death recorded among outcomes, per 1,000 reports596391
Hospitalisation recorded, per 1,000 reports302296213
Consumer-filed share4.4%6.7%45.8%
Top term, share of reportsUrticaria 13.5%median 7.2%0.8%

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 radiographic contrast agent class

DrugName typeReportsLatest 12 monthsMarked serious
Ultravistbrand7,22147063%
Visipaquebrand2,87721491.6%
Optiraybrand2,2475672.8%
Ioversolgeneric1,3895474.5%
Iomeronbrand1,25730199.8%
Isovuebrand1,13916256.5%
Iopamidolgeneric1,0818980.9%
Lipiodolbrand1,06915896.9%
Iopromidegeneric6222194.7%
Iohexolgeneric5234781.5%

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 Omnipaque reports

How many adverse event reports has FDA received for Omnipaque?

7,562 reports list Omnipaque as a suspect or interacting product in the openFDA FAERS release of 28 Sep 2026, covering reports received through June 2026. 661 of them arrived in the latest 12 months. Another 809 list it only as a concomitant medication.

What reactions are recorded in Omnipaque reports?

urticaria (13.5%), pruritus (11.7%), dyspnoea (10%), sneezing (8.1%) and erythema (7.6%). 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 Omnipaque was responsible.

How serious are the reports?

80.7% are marked serious by the reporter. Among the outcomes recorded, 5.9% of reports include death and 30.2% 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 (66%), physician (20.1%) and pharmacist (5.9%). Most reports reach FDA through the manufacturer, which must forward reports it receives.

Are reports for Omnipaque rising?

661 reports in the 12 months to June 2026, close to the 637 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 Omnipaque 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 Omnipaque?

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 Omnipaque as a suspect or interacting product; reports listing it only as a concomitant medication (809) 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.