Reported Reactions

Drugs › Kinase inhibitor

Brand name · Zanubrutinib

Brukinsa: adverse event reports filed with FDA

3,112 reports list it as a suspect or interacting product, 2019–2026. Class: Kinase inhibitor.

3,112
reports as suspect product
0% of all reports · about 473 a year
1,050
reports, 12 months to June 2026
791 in the 12 months before
69.8%
marked serious by the reporter
70.8% across the class
9%
record death among outcomes, as reported
279 reports · not verified by FDA

3,112 adverse event reports received by FDA list the brand name Brukinsa (zanubrutinib) as a suspect or interacting product, from December 2019 to June 2026. A further 241 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, 1,050 reports listed it, up 33% from 791 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 473 reports a year and 0% of the 20,646,523 reports in the database, and 0.4% of the reports for the kinase inhibitor 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 off label use (13.8%), disease progression (6.6%) and contusion (6.4%). A report can list several reactions, so shares add to more than 100%; 661 different terms appear across these reports. Off label use is recorded in 13.8% of these reports, a larger share than in the median kinase inhibitor drug (4.1%).

69.8% of the reports are marked serious by the reporter (70.8% across the class); 9% record death among the outcomes and 25.8% record hospitalisation, as reported. 37.8% of the reports came from consumers, and the largest patient age group is 75 and over (14.6%). 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

068136Jul 2021: 4Aug 2021: 5Sep 2021: 7Oct 2021: 7Nov 2021: 9Dec 2021: 182022Jan 2022: 10Feb 2022: 14Mar 2022: 21Apr 2022: 17May 2022: 31Jun 2022: 18Jul 2022: 19Aug 2022: 28Sep 2022: 29Oct 2022: 26Nov 2022: 37Dec 2022: 232023Jan 2023: 30Feb 2023: 44Mar 2023: 33Apr 2023: 35May 2023: 53Jun 2023: 42Jul 2023: 46Aug 2023: 40Sep 2023: 48Oct 2023: 54Nov 2023: 66Dec 2023: 512024Jan 2024: 59Feb 2024: 44Mar 2024: 49Apr 2024: 55May 2024: 61Jun 2024: 35Jul 2024: 72Aug 2024: 62Sep 2024: 62Oct 2024: 74Nov 2024: 81Dec 2024: 672025Jan 2025: 54Feb 2025: 58Mar 2025: 59Apr 2025: 64May 2025: 77Jun 2025: 61Jul 2025: 96Aug 2025: 68Sep 2025: 136Oct 2025: 70Nov 2025: 100Dec 2025: 902026Jan 2026: 73Feb 2026: 86Mar 2026: 81Apr 2026: 78May 2026: 91Jun 2026: 81

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

04679332019: 120192020: 5720202021: 9520212022: 27320222023: 54220232024: 72120242025: 93320252026: 4902026

2026 covers reports received through June 2026 only.

Reactions recorded in the reports

share of Brukinsa reports recording the termmedian drug in kinase inhibitor

  1. Off label useused for a purpose or in a way not on the label13.8%428
  2. Disease progressionthe disease advanced6.6%204
  3. Contusiona bruise6.4%199
  4. Fatiguetiredness5.3%166
  5. Rashskin rash4.8%148
  6. White blood cell count decreasedlow white cell count4%123
  7. Diarrhoealoose or frequent stools3.8%117
  8. Deaththe patient died; cause not stated by this term3.7%116
  9. Platelet count decreasedlow platelet count3.5%108
  10. Nauseafeeling sick3.2%101
  11. Anaemialow red blood cells3.1%95
  12. Pneumonialung infection2.9%90
  13. Product dose omission issuea dose was missed2.9%90
  14. Astheniaweakness or lack of energy2.8%87
  15. Drug ineffectivethe medicine did not work as expected2.5%78
  16. Dizzinesslight-headedness or unsteadiness2.4%76
  17. Pyrexiafever2.3%73
  18. Arthralgiajoint pain2.2%70
  19. Atrial fibrillationan irregular heart rhythm2.2%68
  20. Dyspnoeashortness of breath2.2%68
  21. Coughcough2.1%64
  22. Painpain, site not specified2.1%64
  23. Peripheral swellingswelling of the arms or legs2.1%64
  24. Headachehead pain2%63
  25. Covid-19COVID-19 infection2%62
  26. Lymphadenopathyswollen lymph nodes2%62
  27. Pruritusitching2%61
  28. Falla fall1.9%60
  29. Haemoglobin decreasedlow haemoglobin1.8%56

Top 30 of 661 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 100 drugs in the kinase 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

Death9%279
Life-threatening2.2%68
Hospitalisation (initial or prolonged)25.8%802
Disability0.9%28
Congenital anomaly0.1%2
Other serious44.4%1,383
Not serious30.2%941

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 849,161 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%0
2 to 110%0
12 to 170%0
18 to 440.7%22
45 to 646.8%211
65 to 7410.6%331
75 and over14.6%455
Age not given67.3%2,093

Patient sex

Female10.1%315
Male14.2%443
Not given75.6%2,354

Who reported

Physician33%1,028
Pharmacist9.8%306
Other health professional19%590
Lawyer0%0
Consumer or non-health professional37.8%1,175
Not given0.4%13

Age and sex as stated in the report; the reporter's qualification is the primary source recorded by FDA. 54.5% of reports give the United States as the country of the event or reporter.

Reason for use recorded

Indication as recorded (MedDRA)ReportsShare
Chronic lymphocytic leukaemia85427.4%
Waldenstrom's macroglobulinaemia53417.2%
Mantle cell lymphoma35011.2%
Diffuse large b-cell lymphoma1866%
Marginal zone lymphoma1133.6%
Lymphoma622%

The indication field is filled in by the reporter and is often blank; shares are of all 3,112 reports.

Drugs most often listed in the same reports

Drug (any role in the report)ReportsShare of Brukinsa reports
Rituximab3079.9%
Cyclophosphamide1514.9%
Venetoclax1073.4%
Lenalidomide1043.3%
Allopurinol1023.3%
Prednisone712.3%
Aspirin662.1%
Ibrutinib652.1%
Eliquis632%
Doxorubicin hydrochloride622%

Other products listed in reports where Brukinsa 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

MeasureBrukinsaKinase inhibitorAll reports
Reports as suspect product3,112849,16120,646,523
Share of that pool—0.4%0%
Reports, latest 12 months1,050—1,332,454
Marked serious69.8%70.8%57.4%
Death recorded among outcomes, per 1,000 reports9019091
Hospitalisation recorded, per 1,000 reports258264213
Consumer-filed share37.8%42.3%45.8%
Top term, share of reportsOff label use 13.8%median 4.1%4.1%

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 kinase inhibitor class

DrugName typeReportsLatest 12 monthsMarked serious
Ibrancebrand81,9122,38047.1%
Imbruvicabrand67,0392,28374.4%
Cabometyxbrand41,8184,90440.4%
Sutentbrand33,21517574.5%
Afinitorbrand30,70616171.3%
Sprycelbrand27,25555749.7%
Tasignabrand24,91132870.9%
Kisqalibrand24,6033,41379.2%
Ofevbrand23,9072,43466.9%
Gleevecbrand23,1328174.7%
Tagrissobrand23,0851,41092.3%
Lenvimabrand22,3502,64387.3%
Votrientbrand22,08411960.9%
Mekinistbrand17,07091664%
Inlytabrand15,69638860.9%

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 Brukinsa reports

How many adverse event reports has FDA received for Brukinsa?

3,112 reports list Brukinsa as a suspect or interacting product in the openFDA FAERS release of 28 Sep 2026, covering reports received through June 2026. 1,050 of them arrived in the latest 12 months. Another 241 list it only as a concomitant medication.

What reactions are recorded in Brukinsa reports?

off label use (13.8%), disease progression (6.6%), contusion (6.4%), fatigue (5.3%) and myelosuppression (5%). 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 Brukinsa was responsible.

How serious are the reports?

69.8% are marked serious by the reporter. Among the outcomes recorded, 9% of reports include death and 25.8% 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 (37.8%), physician (33%) and other health professional (19%). Most reports reach FDA through the manufacturer, which must forward reports it receives.

Are reports for Brukinsa rising?

1,050 reports in the 12 months to June 2026, up 33% from 791 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 Brukinsa 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 Brukinsa?

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 Brukinsa as a suspect or interacting product; reports listing it only as a concomitant medication (241) 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.