Clofarabine: adverse event reports filed with FDA

2,020

reports as suspect product

0% of all reports · about 92 a year

77

reports, 12 months to June 2026

82 in the 12 months before

96.5%

marked serious by the reporter

92.2% across the class

40.8%

record death among outcomes, as reported

824 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 Clofarabine reports recording the termmedian drug in nucleoside metabolic inhibitor

1. Febrile neutropeniafever with low white blood cells13.3%268
2. Off label useused for a purpose or in a way not on the label9.6%193
3. Pyrexiafever9.3%187
4. Sepsisa severe body-wide response to infection7.5%151
5. Drug ineffectivethe medicine did not work as expected7%142
6. Mucosal inflammation6.2%125
7. Neutropenialow neutrophils, a type of white blood cell5.6%113
8. Nauseafeeling sick5.4%109
9. Vomitingbeing sick5%102
10. Pancytopenialow counts of all blood cells4.7%94
11. Blood bilirubin increased4.6%92
12. Bone marrow failure4.4%89
13. Hypotensionlow blood pressure4.3%87
14. Pneumonialung infection4.3%87
15. Deaththe patient died; cause not stated by this term4.1%83
16. Aspartate aminotransferase increasedraised liver enzyme (AST)3.9%79
17. Alanine aminotransferase increasedraised liver enzyme (ALT)3.8%77
18. Multiple organ dysfunction syndromeseveral organs failing3.8%76
19. Oedemaswelling from fluid3.8%76
20. Respiratory failurethe lungs could not supply enough oxygen3.7%75
21. Thrombocytopenialow platelets3.7%74
22. Multi-organ failure3.6%73
23. Septic shockshock arising from infection3.4%68
24. Diarrhoealoose or frequent stools3.3%67
25. Haematotoxicity3.3%67
26. Product use in unapproved indicationused for a purpose not on the label3.2%65
27. Acute kidney injurysudden loss of kidney function3.1%63
28. Palmar-plantar erythrodysaesthesia syndrome3.1%63
29. Renal failurekidney failure3%60
30. Renal failure acute2.9%59

Top 30 of 526 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 19 drugs in the nucleoside metabolic 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 313,386 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. 48.2% 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 2,020 reports.

Drugs most often listed in the same reports

Other products listed in reports where Clofarabine 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 nucleoside metabolic 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 Clofarabine as a suspect or interacting product; reports listing it only as a concomitant medication (354) 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.