Drugs › Gonadotropin releasing hormone receptor antagonist
Brand name · Relugolix, estradiol hemihydrate, and norethindrone acetate
Myfembree: adverse event reports filed with FDA
1,481 reports list it as a suspect or interacting product, 2021–2026. Class: Gonadotropin releasing hormone receptor antagonist.
- 1,481
- reports as suspect product
- 0% of all reports · about 307 a year
- 118
- reports, 12 months to June 2026
- 195 in the 12 months before
- 10.5%
- marked serious by the reporter
- 23.4% across the class
- 0.1%
- record death among outcomes, as reported
- 1 reports · not verified by FDA
Between September 2021 and June 2026, 1,481 adverse event reports received by FDA list the brand name Myfembree (relugolix, estradiol hemihydrate, and norethindrone acetate) as a suspect or interacting product. Reports that mention it only as a concomitant medication (14) are left out of every figure here.
In the 12 months to June 2026, 118 reports listed it, down 39% from 195 in 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 307 reports a year and 0% of the 20,646,523 reports in the database, and 5.3% of the reports for the gonadotropin releasing hormone receptor antagonist class. How many people take it is not in the data, so a count is not a rate of occurrence.
Reporters most often recorded therapy interrupted (31.7%), heavy menstrual bleeding (15.7%) and intermenstrual bleeding (8%). A report can list several reactions, so shares add to more than 100%; 135 different terms appear across these reports. Therapy interrupted is recorded in 31.7% of these reports, a larger share than in the median gonadotropin releasing hormone receptor antagonist drug (7.6%).
10.5% of the reports are marked serious by the reporter (23.4% across the class); 0.1% record death among the outcomes and 2.3% record hospitalisation, as reported. 67.8% of the reports came from consumers, and the largest patient age group is 18 to 44 (24.6%). 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 Myfembree reports recording the termmedian drug in gonadotropin releasing hormone receptor antagonist
- Therapy interrupted31.7%469
- Heavy menstrual bleeding15.7%233
- Headachehead pain4.8%71
- Off label useused for a purpose or in a way not on the label4.7%69
- Alopeciahair loss4.5%66
- Hot flusha hot flush4.5%66
- Menstruation irregularirregular periods4.1%61
- Dysmenorrhoea4%59
- Nauseafeeling sick3.4%51
- Painpain, site not specified3%44
- Drug ineffectivethe medicine did not work as expected2.6%39
- Depressionlow mood2%30
- Fatiguetiredness2%29
- Inappropriate schedule of product administrationthe product was taken at the wrong times1.9%28
- Menstrual disorder1.8%26
- Mood swingsmood swings1.8%26
- Suicidal ideationthoughts of suicide1.7%25
- Weight increasedweight gain1.7%25
- Muscle spasmsmuscle cramps1.6%24
- Anxietyanxiety1.6%23
- Haemorrhagebleeding1.5%22
- Polymenorrhoea1.5%22
- Dizzinesslight-headedness or unsteadiness1.4%21
- Insurance issue1.4%21
- Product dose omission issuea dose was missed1.4%21
- Amenorrhoeaperiods stopped1.3%19
- Blood pressure increaseda raised blood pressure reading1.2%18
- Abdominal pain upperupper stomach pain1.1%17
- Deep vein thrombosisa blood clot in a deep vein1.1%16
Top 30 of 135 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 4 drugs in the gonadotropin releasing hormone 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 28,126 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. 99.5% of reports give the United States as the country of the event or reporter.
Reason for use recorded
| Indication as recorded (MedDRA) | Reports | Share |
|---|---|---|
| Uterine leiomyoma | 506 | 34.2% |
| Endometriosis | 249 | 16.8% |
| Heavy menstrual bleeding | 142 | 9.6% |
| Abnormal uterine bleeding | 12 | 0.8% |
| Adenomyosis | 6 | 0.4% |
| Uterine haemorrhage | 6 | 0.4% |
The indication field is filled in by the reporter and is often blank; shares are of all 1,481 reports.
In context
| Measure | Myfembree | Gonadotropin releasing hormone receptor antagonist | All reports |
|---|---|---|---|
| Reports as suspect product | 1,481 | 28,126 | 20,646,523 |
| Share of that pool | — | 5.3% | 0% |
| Reports, latest 12 months | 118 | — | 1,332,454 |
| Marked serious | 10.5% | 23.4% | 57.4% |
| Death recorded among outcomes, per 1,000 reports | 1 | 38 | 91 |
| Hospitalisation recorded, per 1,000 reports | 23 | 80 | 213 |
| Consumer-filed share | 67.8% | 86.1% | 45.8% |
| Top term, share of reports | Therapy interrupted 31.7% | median 7.6% | 0.3% |
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 gonadotropin releasing hormone receptor antagonist class
| Drug | Name type | Reports | Latest 12 months | Marked serious |
|---|---|---|---|---|
| Orgovyx | brand | 22,329 | 5,602 | 22.5% |
| Orilissa | brand | 3,198 | 29 | 32.4% |
| Ganirelix acetate | generic | 1,118 | 30 | 32.4% |
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 Myfembree reports
How many adverse event reports has FDA received for Myfembree?
1,481 reports list Myfembree as a suspect or interacting product in the openFDA FAERS release of 28 Sep 2026, covering reports received through June 2026. 118 of them arrived in the latest 12 months. Another 14 list it only as a concomitant medication.
What reactions are recorded in Myfembree reports?
therapy interrupted (31.7%), heavy menstrual bleeding (15.7%), intermenstrual bleeding (8%), headache (4.8%) and off label use (4.7%). 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 Myfembree was responsible.
How serious are the reports?
10.5% are marked serious by the reporter. Among the outcomes recorded, 0.1% of reports include death and 2.3% 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?
consumer or non-health professional (67.8%), physician (20.1%) and other health professional (10.5%). Most reports reach FDA through the manufacturer, which must forward reports it receives.
Are reports for Myfembree rising?
118 reports in the 12 months to June 2026, down 39% from 195 in 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 Myfembree 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 Myfembree?
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 Myfembree as a suspect or interacting product; reports listing it only as a concomitant medication (14) 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.