Toxic epidermal necrosis associated with phenobarbitone: a case report and brief review of the literatures.

BACKGROUND: Toxic epidermal necrolysis (TEN)/Stevens-Johnson syndrome (SJS) is the spectrum of severe, acute, mucocutaneous, T-cell mediated delayed type IV hypersensitivity reaction and universally related to different drugs. Phenobarbitone is known to cause hypersensitivity reactions with benign pattern; ranging from a mild to moderate rashes but not life-threatening reactions such as TEN/SJS.

CASE REPORT: We report a 14-year-old asthmatic male patient admitted to a local hospital for an acute exacerbation of asthma, after he presented with shortness of breath, cough, and fever. He was treated with bronchodilator and antibiotics. On subsequent days, the patient developed new onset generalized tonic clonic seizure in the hospital for which he was started on phenobarbitone of 100 mg twice daily. Two weeks after initiation of phenobarbitone, the patient developed extensive blistering skin eruptions; which subsequently exfoliated unevenly. Associated with the hypersensitivity skin reaction, the patient reported low grade fever, sore throat, and dysphagia. The exfoliation also involved oral and conjunctival mucosa; with estimated 65% body surface area involvement. The laboratory investigations were relevant for mild leucocytosis, prolonged prothrombin time, and reduced albumin. Phenobarbitone was discontinued and replaced with clonazepam; and the patient was managed with fluids replacement, IV antibiotics, twice daily wound care, analgesics, and naso gastric tube feeding. On subsequent days the patients' clinical condition started improving; the skin lesion also started to heal and exfoliate in most of the affected skin surface areas, and the patient was discharged improved after ten days of intensive care unit.

CONCLUSION: In summary, the present case describes, a 14-years-old young child with history of asthma and seizure disorder; and developed toxic epidermal necrosis following exposure to Phenobarbitone. This case also highlighted the better prognosis observed in pediatric population with TEN.