Osimertinib: adverse event reports filed with FDA

7,639

reports as suspect product

0% of all reports · about 717 a year

3,093

reports, 12 months to June 2026

2,281 in the 12 months before

98.8%

marked serious by the reporter

70.8% across the class

33.6%

record death among outcomes, as reported

2,570 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 Osimertinib reports recording the termmedian drug in kinase inhibitor

1. Deaththe patient died; cause not stated by this term23.8%1,817
2. Malignant neoplasm progression17%1,298
3. Drug resistance10.1%775
4. Diarrhoealoose or frequent stools5.3%405
5. Acquired gene mutation5.2%401
6. Fatiguetiredness4%302
7. Disease progressionthe disease advanced3.6%272
8. Astheniaweakness or lack of energy3%230
9. Rashskin rash3%226
10. Off label useused for a purpose or in a way not on the label2.9%220
11. Drug ineffectivethe medicine did not work as expected2.7%207
12. Metastases to central nervous system2.6%197
13. Dyspnoeashortness of breath2.5%194
14. Nauseafeeling sick2.5%188
15. Decreased appetitereduced appetite2.2%171
16. Metastases to meninges2.1%159
17. Pleural effusionfluid around the lung1.7%128
18. Neuropathy peripheralnerve damage in hands or feet1.5%118
19. Thrombosis1.5%115
20. Coughcough1.4%109
21. Metastases to liver1.4%109
22. EGFR gene mutation1.4%108
23. Vomitingbeing sick1.4%108
24. Product dose omission issuea dose was missed1.4%107
25. Weight decreasedweight loss1.4%107
26. General physical health deteriorationgeneral decline in health1.4%106
27. Pneumonialung infection1.4%105
28. Painpain, site not specified1.4%104
29. Pneumonitis1.3%99
30. Malignant transformation1.3%96

Top 30 of 846 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

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

Age and sex as stated in the report; the reporter's qualification is the primary source recorded by FDA. 39.8% 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 7,639 reports.

Drugs most often listed in the same reports

Other products listed in reports where Osimertinib 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 kinase inhibitor 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 Osimertinib as a suspect or interacting product; reports listing it only as a concomitant medication (706) 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.