Kidney injury associated with fosravuconazole L-lysine ethanolate.

Background: Fosravuconazole L-lysine ethanolate (F-RVCZ) is a prodrug of ravuconazole and a triazole antifungal drug used for the treatment of onychomycosis. It has been reported in previous studies that the kidney injury caused by F-RVCZ is 1% or less.

Methods: Serum creatinine levels were compared, and glomerular filtration rate and urine protein were estimated before and after starting the administration of F-RVCZ, as well as after the end of the administration period. The cause of kidney injury was investigated using renal pathology, and risk factors were also investigated.

Results: F-RVCZ was administered to 46 patients. Ten of these patients were excluded because three were maintenance dialysis patients and seven were not measured for serum creatinine. Remaining 36 patients were included in the analyses. Kidney injury occurred in 27.8% of patients treated with F-RVCZ; this condition persisted in 10% of patients after the end of the administration period. No changes were observed in the urinalysis after the administration of F-RVCZ. A kidney biopsy was performed in one patient, but no lesions were found that could be the cause of kidney injury. Patients who developed kidney injury were significantly more likely to be receiving angiotensin-converting enzyme inhibitors or angiotensin II receptor blockers (odds ratio 18.9, 95% confidential interval: 1.69-210, p = 0.0169).

Conclusion: Kidney injury is caused by F-RVCZ more frequently than previously reported, but the mechanism remains unclear.