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Fluconazole Side Effects

The most commonly reported side effects of fluconazole include off label use, pyrexia, and nausea, based on 70,297 FDA adverse event reports from 2004 to 2025. 6.6% of reports found the drug to be ineffective.

Fluconazole side effects

Percentages show how often each reaction appears relative to total reports for fluconazole.

1
Drug Ineffective6.6%4,669
2
Off Label Use6.2%4,374
3
Pyrexia4.6%3,252
4
Nausea4.3%2,990
5
Diarrhoea4.1%2,895
6
Fatigue4.0%2,784
7
Pain3.7%2,579
8
Drug Interaction3.6%2,506
9
Headache3.5%2,481
10
Pneumonia3.3%2,317
11
Acute Kidney Injury3.1%2,206
12
Febrile Neutropenia3.1%2,152
13
Rash3.0%2,086
14
Death2.7%1,914
15
Dyspnoea2.6%1,853

These are voluntary reports and do not establish that fluconazole caused these reactions.

Report severity

84.9%Serious59,684 reports
44.0%Hospitalizations30,921 reports
18.0%Fatal12,627 reports

Seriousness is determined by the reporter, not by OpenClaim.

Fluconazole drug interactions

Other drugs that appear in adverse event reports alongside fluconazole. Drugs flagged as a suspected cause appear in the first column. Drugs taken at the same time but not suspected appear in the second.

Also suspected

1
Cyclophosphamide4.7%3,322
2
Lenalidomide4.7%3,316
3
Dexamethasone4.7%3,279
4
Rituximab4.0%2,795
5
Prednisone3.8%2,671
6
Tacrolimus3.3%2,312
7
Pantoprazole-sodium2.9%2,060
8
Methylprednisolone2.9%2,057
9
Vancomycin2.9%2,048
10
Ciprofloxacin2.9%2,005
11
Methotrexate2.8%1,974
12
Amphotericin-b2.8%1,936
13
Cytarabine2.7%1,892
14
Vincristine-sulfate2.7%1,890
15
Doxorubicin-hydrochloride2.7%1,878

Taken alongside

1
Acetaminophen18.3%12,890
2
Acyclovir17.8%12,546
3
Ondansetron12.5%8,756
4
Omeprazole11.3%7,915
5
Prednisone10.8%7,582
6
Sulfamethoxazole10.7%7,555
7
Furosemide10.7%7,514
8
Albuterol10.3%7,220
9
Pantoprazole-sodium9.6%6,733
10
Aspirin9.5%6,706
11
Trimethoprim9.1%6,425
12
Dexamethasone9.1%6,424
13
Ergocalciferol8.8%6,169
14
Levofloxacin8.5%5,981
15
Gabapentin8.1%5,711

Co-occurrence in adverse event reports does not establish a drug interaction. Patients often take multiple medications, and these lists reflect prescribing patterns rather than causal relationships. Consult a healthcare provider about potential drug interactions.

Who reports fluconazole side effects

52.4% of fluconazole adverse event reports involve female patients and 38.4% involve male patients. The largest age group is adult at 58%. These figures reflect who reports side effects, not underlying risk.

Sex

Female52.4%
Male38.4%
Unknown9.2%

Age group

< 22.1%
2–113.8%
12–172.6%
18–6458.4%
65+33.1%

What is fluconazole used for

Conditions and purposes for which patients were taking fluconazole when the adverse event was reported.

Abdominal AbscessAbdominal DistensionAbdominal InfectionAbdominal SepsisAbscessAbscess FungalAcanthamoeba InfectionAcanthamoeba KeratitisAccidental ExposureAcinetobacter InfectionAcinetobacter Test PositiveAcneAcquired HaemophiliaAcquired Immunodeficiency SyndromeActinomycosis

Showing 15 of 1,629 indications

Fluconazole brand names and reporting trend

Fluconazole is sold under the brand name Diflucan.

Brand names

Diflucan63,914

Quarterly reports (20042025)

20052010201520202025

An upward trend reflects increased FAERS reporting overall, not necessarily increased risk.

Taking fluconazole with another medication?

Ask OpenClaim about your specific drug combination. Get a sourced report using FDA data, drug labels, and medical literature.