Pataday Once Daily Relief: adverse event reports filed with FDA

1,008

reports as suspect product

0% of all reports · about 189 a year

205

reports, 12 months to June 2026

222 in the 12 months before

2.1%

marked serious by the reporter

57.7% across the class

0%

record death among outcomes, as reported

0 reports · not verified by FDA

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 Pataday Once Daily Relief reports recording the termmedian drug in histamine-1 receptor antagonist

1. Drug ineffectivethe medicine did not work as expected27.3%275
2. Eye irritationeye irritation20.7%209
3. Vision blurredblurred vision17.6%177
4. Eye discharge15.6%157
5. Eye pruritus8.4%85
6. Ocular hyperaemiaa red eye8.1%82
7. Eye paineye pain7%71
8. Ocular discomfort5.4%54
9. Condition aggravatedthe condition being treated got worse5.2%52
10. Lacrimation increasedwatery eyes4.1%41
11. Eye swellinga swollen eye3.9%39
12. Product physical consistency issue3.6%36
13. Liquid product physical issue3.2%32
14. Headachehead pain2.7%27
15. Eyelid margin crusting2.5%25
16. Dry eyedry eye2.3%23
17. Foreign body sensation in eyes2.1%21
18. Visual impairmentreduced vision2%20
19. Swelling of eyelid1.8%18
20. Dysgeusiaaltered taste1.7%17
21. Hypersensitivityan allergic-type reaction1.7%17
22. Product quality issuea problem with the product itself1.7%17
23. Accidental overdosean accidental overdose1.6%16
24. Drug hypersensitivityan allergic-type reaction to a medicine1.6%16
25. Expired product administeredthe product was used past its expiry date1.6%16
26. Patient dissatisfaction with treatment1.6%16
27. Product odour abnormalthe product smelt odd1.6%16
28. Abnormal sensation in eye1.5%15
29. Product packaging quantity issue1.5%15
30. Drug effect less than expected1.4%14

Top 30 of 99 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 34 drugs in the histamine-1 receptor antagonist 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 135,666 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

Age and sex as stated in the report; the reporter's qualification is the primary source recorded by FDA. 100% of reports give the United States as the country of the event or reporter.

Reason for use recorded

The indication field is filled in by the reporter and is often blank; shares are of all 1,008 reports.

In context

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 histamine-1 receptor antagonist class

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.

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 Pataday Once Daily Relief as a suspect or interacting product; reports listing it only as a concomitant medication (206) 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.