Carbamazepine-induced hypersensitivity syndrome occurring in a photodistributed pattern

Area of Science:

• Pharmacology
• Dermatology
• Toxicology

Background:

• Carbamazepine is an anticonvulsant medication used to treat epilepsy and neuropathic pain.
• Drug-induced hypersensitivity syndrome (DIHS) is a severe, systemic drug reaction characterized by rash, fever, and organ involvement.

Observation:

• A 76-year-old male patient developed a rash, fever, lymphadenopathy, eosinophilia, abnormal liver function tests, and atypical lymphocytosis after starting carbamazepine for partial seizures.
• The patient's rash exhibited a photodistributed pattern, suggesting sensitivity to light exposure.

Findings:

• The patient's symptoms met the diagnostic criteria for drug-induced hypersensitivity syndrome (DIHS).
• Discontinuation of carbamazepine and treatment with topical steroids led to the resolution of the rash, normalization of liver function, and improvement in eosinophilia.

Implications:

• This case highlights the importance of recognizing carbamazepine as a potential cause of DIHS.
• The unusual photodistributed rash pattern in carbamazepine-induced DIHS warrants further investigation and clinical attention.