Challenges in acute cyclosporine toxicity in a child with steroid-dependent nephrotic syndrome.

Despite its widespread use in patients undergoing organ transplantation or managing nephrotic syndrome, there is a lack of literature on the acute toxicity of cyclosporine A (CsA). This report presents a case of acute CsA toxicity resulting from an accidental overdose in a 2-year-old boy with steroid dependent nephrotic syndrome. Remarkably, despite a tenfold overdose and elevated trough levels, the patient remained asymptomatic, and the CsA trough level normalized within 48 h with rapid intervention, including discontinuation of CsA, intravenous hydration, and cytochrome P450 induction. This case emphasizes the critical importance of prompt and appropriate management to prevent serious consequences in such scenarios.