Reported Reactions

Drugs › Azole antifungal

Brand name · Isavuconazonium sulfate (kyo)

Cresemba: adverse event reports filed with FDA

2,050 reports list it as a suspect or interacting product, 2015–2026. Class: Azole antifungal.

2,050
reports as suspect product
0% of all reports · about 184 a year
254
reports, 12 months to June 2026
187 in the 12 months before
57.5%
marked serious by the reporter
79% across the class
18.8%
record death among outcomes, as reported
385 reports · not verified by FDA

Between May 2015 and June 2026, 2,050 adverse event reports received by FDA list the brand name Cresemba (isavuconazonium sulfate (kyo)) as a suspect or interacting product. Reports that mention it only as a concomitant medication (1,159) are left out of every figure here.

In the 12 months to June 2026, 254 reports listed it, up 36% from 187 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 184 reports a year and 0% of the 20,646,523 reports in the database, and 3% of the reports for the azole antifungal class. How many people take it is not in the data, so a count is not a rate of occurrence.

Reporters most often recorded off label use (37.5%), death (8.2%) and nausea (4.1%). A report can list several reactions, so shares add to more than 100%; 304 different terms appear across these reports. Off label use is recorded in 37.5% of these reports, a larger share than in the median azole antifungal drug (5.6%).

57.5% of the reports are marked serious by the reporter (79% across the class); 18.8% record death among the outcomes and 18.1% record hospitalisation, as reported. 43.3% of the reports came from consumers, and the largest patient age group is 45 to 64 (17%). 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

01632Jul 2021: 7Aug 2021: 8Sep 2021: 14Oct 2021: 3Nov 2021: 9Dec 2021: 22022Jan 2022: 5Feb 2022: 5Mar 2022: 25Apr 2022: 8May 2022: 5Jun 2022: 3Jul 2022: 2Aug 2022: 2Sep 2022: 5Oct 2022: 8Nov 2022: 8Dec 2022: 232023Jan 2023: 4Feb 2023: 2Mar 2023: 30Apr 2023: 4May 2023: 10Jun 2023: 12Jul 2023: 9Aug 2023: 11Sep 2023: 8Oct 2023: 11Nov 2023: 15Dec 2023: 122024Jan 2024: 9Feb 2024: 14Mar 2024: 24Apr 2024: 18May 2024: 19Jun 2024: 8Jul 2024: 11Aug 2024: 17Sep 2024: 16Oct 2024: 16Nov 2024: 12Dec 2024: 162025Jan 2025: 16Feb 2025: 13Mar 2025: 17Apr 2025: 15May 2025: 19Jun 2025: 19Jul 2025: 28Aug 2025: 13Sep 2025: 20Oct 2025: 15Nov 2025: 15Dec 2025: 142026Jan 2026: 22Feb 2026: 32Mar 2026: 21Apr 2026: 21May 2026: 24Jun 2026: 29

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

02625232015: 5420152016: 2372017: 52320172018: 1312019: 13720192020: 1182021: 9020212022: 992023: 12820232024: 1802025: 20420252026: 149

2026 covers reports received through June 2026 only.

Reactions recorded in the reports

share of Cresemba reports recording the termmedian drug in azole antifungal

  1. Off label useused for a purpose or in a way not on the label37.5%769
  2. Deaththe patient died; cause not stated by this term8.2%168
  3. Nauseafeeling sick4.1%84
  4. Condition aggravatedthe condition being treated got worse3.8%77
  5. Drug ineffectivethe medicine did not work as expected3.2%65
  6. Drug interactionan interaction between medicines2.6%53
  7. Febrile neutropeniafever with low white blood cells1.8%37
  8. Pyrexiafever1.8%37
  9. Diarrhoealoose or frequent stools1.6%33
  10. Wrong technique in product usage processthe product was used in the wrong way1.6%33
  11. Disease progressionthe disease advanced1.5%31
  12. Dysphagiadifficulty swallowing1.5%31
  13. Product use in unapproved indicationused for a purpose not on the label1.5%31
  14. Vomitingbeing sick1.5%31
  15. Decreased appetitereduced appetite1.5%30
  16. Inappropriate schedule of drug administrationthe medicine was taken at the wrong times1.4%28
  17. Pneumonialung infection1.4%28
  18. Acute kidney injurysudden loss of kidney function1.3%27
  19. Dyspnoeashortness of breath1.2%25
  20. Fatiguetiredness1.2%25
  21. Infectionan infection, type not specified1.2%24
  22. Neutropenialow neutrophils, a type of white blood cell1.1%23
  23. Fungal infectiona fungal infection1.1%22
  24. Underdoseless than the intended dose1.1%22
  25. Headachehead pain1%21
  26. Multiple organ dysfunction syndromeseveral organs failing1%21
  27. Malaisegeneral feeling of being unwell0.9%19

Top 30 of 304 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 16 drugs in the azole antifungal 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

Death18.8%385
Life-threatening4%81
Hospitalisation (initial or prolonged)18.1%372
Disability0.8%16
Congenital anomaly0%0
Other serious37.7%773
Not serious42.5%871

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 69,035 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%1
2 to 111%20
12 to 171.6%33
18 to 449%185
45 to 6417%349
65 to 7415.1%310
75 and over9.4%193
Age not given46.8%959

Patient sex

Female36.5%748
Male55.4%1,135
Not given8.1%167

Who reported

Physician25.7%526
Pharmacist12.4%255
Other health professional17.9%367
Lawyer0%1
Consumer or non-health professional43.3%887
Not given0.7%14

Age and sex as stated in the report; the reporter's qualification is the primary source recorded by FDA. 62.8% of reports give the United States as the country of the event or reporter.

Reason for use recorded

Indication as recorded (MedDRA)ReportsShare
Aspergillus infection34817%
Bronchopulmonary aspergillosis21210.3%
Fungal infection1416.9%
Mucormycosis1125.5%
Acute myeloid leukaemia703.4%
Pneumonia522.5%

The indication field is filled in by the reporter and is often blank; shares are of all 2,050 reports.

Drugs most often listed in the same reports

Drug (any role in the report)ReportsShare of Cresemba reports
Voriconazole1155.6%
Meropenem934.5%
Ambisome904.4%
Amphotericin b773.8%
Vancomycin572.8%
Pantoprazole532.6%
Bactrim412%
Furosemide412%
Posaconazole371.8%
Prednisone351.7%

Other products listed in reports where Cresemba 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

MeasureCresembaAzole antifungalAll reports
Reports as suspect product2,05069,03520,646,523
Share of that pool—3%0%
Reports, latest 12 months254—1,332,454
Marked serious57.5%79%57.4%
Death recorded among outcomes, per 1,000 reports18817791
Hospitalisation recorded, per 1,000 reports181317213
Consumer-filed share43.3%23.9%45.8%
Top term, share of reportsOff label use 37.5%median 5.6%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 azole antifungal class

DrugName typeReportsLatest 12 monthsMarked serious
Fluconazolegeneric17,1751,45890.7%
Voriconazolegeneric13,49595694.7%
Vfendbrand6,7527686.5%
Itraconazolegeneric4,55236490.4%
Posaconazolegeneric4,23458991.7%
Ketoconazolegeneric4,04723441.7%
Noxafilbrand3,2303966.7%
Diflucanbrand3,1476569.8%
Clotrimazolegeneric2,75729880.4%
Sporanoxbrand1,7284387.6%
Tioconazolegeneric1,4691973.1%
Jubliabrand1,2717918%
Miconazole nitrategeneric1,26016622.5%
Nizoralbrand1,21834829.5%
Miconazolegeneric6503072.3%

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 Cresemba reports

How many adverse event reports has FDA received for Cresemba?

2,050 reports list Cresemba as a suspect or interacting product in the openFDA FAERS release of 28 Sep 2026, covering reports received through June 2026. 254 of them arrived in the latest 12 months. Another 1,159 list it only as a concomitant medication.

What reactions are recorded in Cresemba reports?

off label use (37.5%), death (8.2%), nausea (4.1%), condition aggravated (3.8%) and drug ineffective (3.2%). 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 Cresemba was responsible.

How serious are the reports?

57.5% are marked serious by the reporter. Among the outcomes recorded, 18.8% of reports include death and 18.1% 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 (43.3%), physician (25.7%) and other health professional (17.9%). Most reports reach FDA through the manufacturer, which must forward reports it receives.

Are reports for Cresemba rising?

254 reports in the 12 months to June 2026, up 36% from 187 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 Cresemba 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 Cresemba?

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 Cresemba as a suspect or interacting product; reports listing it only as a concomitant medication (1,159) 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.