Benzalkonium chloride induced corrosive balanoposthitis in a man requiring clean intermittent catheterization

INTRODUCTION: Men who require intermittent catheterization may be susceptible to balanoposthitis. Benzalkonium chloride is commonly used to disinfect reusable catheters, but the concentration of this solution is critical. CASE PRESENTATION: A 40‐year‐old man presented with fever, pus around the glans and foreskin, and difficult catheterization. On physical examination, his urethral meatus was too narrow to insert a catheter. Suprapubic catheterization and 2 weeks of intravenous and topical treatment cured the ulcer of the glans. However, after restarting catheterization, the ulcer of the glans relapsed, and the patient’s urethral meatus was completely closed. Circumcision and incision of the meatus were performed, and antibiotics were administered. Unexpectedly, restarting catheterization caused recurrent balanoposthitis. Close inquiry revealed that the patient was using a 10% benzalkonium chloride soaking solution for a reusable catheter, which was a toxic concentration. CONCLUSION: The disinfectant concentration should be confirmed when refractory balanoposthitis is encountered in patients who require catheterization.