Estring: adverse event reports filed with FDA

3,813

reports as suspect product

0% of all reports · about 171 a year

115

reports, 12 months to June 2026

167 in the 12 months before

30.5%

marked serious by the reporter

57.2% across the class

0.9%

record death among outcomes, as reported

34 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 Estring reports recording the termmedian drug in estrogen

1. Drug ineffectivethe medicine did not work as expected14.8%565
2. Vulvovaginal discomfort10.4%395
3. Off label useused for a purpose or in a way not on the label6.1%234
4. Vulvovaginal pain6.1%233
5. Product quality issuea problem with the product itself5.4%207
6. Vaginal discharge4.4%166
7. Vaginal haemorrhagevaginal bleeding3.7%142
8. Fungal infectiona fungal infection3.5%134
9. Vulvovaginal mycotic infectionvaginal thrush3.4%130
10. Urinary tract infectionbladder or urinary infection3.4%129
11. Painpain, site not specified3.3%127
12. Headachehead pain3.1%118
13. Vaginal infection3%114
14. Device use issue2.7%103
15. Malaisegeneral feeling of being unwell2.6%99
16. Vulvovaginal burning sensation2.6%99
17. Vulvovaginal pruritus2.5%97
18. Feeling abnormalfeeling odd or not right2.4%92
19. Muscle spasmsmuscle cramps2.4%90
20. Nauseafeeling sick2.3%89
21. Hot flusha hot flush2.3%88
22. Vulvovaginal dryness2.2%85
23. Device difficult to usethe device was hard to use2.2%83
24. Discomfortdiscomfort2%78
25. Breast cancerbreast cancer1.8%70
26. Drug ineffective for unapproved indication1.8%68
27. Vaginal odour1.8%67
28. Dizzinesslight-headedness or unsteadiness1.6%60
29. Device issuea problem with the device1.5%59
30. Product use issuea problem in how the product was used1.5%59

Top 30 of 384 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 25 drugs in the estrogen 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 127,523 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. 96.4% 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 3,813 reports.

Drugs most often listed in the same reports

Other products listed in reports where Estring 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

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 estrogen 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 Estring as a suspect or interacting product; reports listing it only as a concomitant medication (679) 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.