Status epilepticus resulted in rhabdomyolysis-induced AKI associated with hepatotoxicity induced by synergistic carbamazepine and diazepam: A case report.

Rationale: Rhabdomyolysis is a serious complication of status epilepticus (SE) caused by muscle cell damage and can lead to a life-threatening acute kidney injury (AKI).

Patient Concerns: A 35-year-old man with a history of seizures treated with 3 different antiepileptic drugs (carbamazepine, lamotrigine, and levetiracetam) presented with SE. The patient received 5 doses of diazepam to control the SE in another hospital and was transferred to our emergency due to AKI.

Diagnoses: Laboratory tests corresponded with rhabdomyolysis-induced AKI and disseminated intravascular coagulation. Thereafter, the decrease in renal excretion of both drugs (diazepam and carbamazepine) caused acute liver injury and neurotoxicity. The carbamazepine concentration was 16.39 mcg/mL, which considered in toxic level, despite using the usual dose.

Interventions: The patient was treated with hydration and sodium bicarbonate, however; severe AKI mandated a hemodialysis session.

Outcomes: The diuresis started to increase, kidney and liver functions improved, and altered mental status reversed.

Lessons: This case alerts physicians to consider the synergistic drug side effects and interactions, especially when patients present with impaired liver or kidney functions. The reduction in metabolism or excretion of drugs can cause an increase in serum concentrations and induce toxicity, even when the drug intake at the usual dose.