Carbamazepine carries a high risk of Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) in individuals of Asian ancestry with the HLA-B*1502 allele, making it contraindicated without prior genetic screening.
Genetic screening is strongly recommended for Asian patients prior to starting carbamazepine to identify HLA-B*1502 carriers.
Contraindicated in confirmed carriers due to >10-fold increased SJS/TEN risk.
Monitor for early signs of hypersensitivity (e.g., rash, fever) in all patients, but especially at-risk groups.
FDA black box warning highlights this pharmacogenetic interaction.
The HLA-B*1502 allele, common in Asian populations, triggers an immune-mediated hypersensitivity reaction to carbamazepine, leading to cytotoxic T-cell activation and keratinocyte apoptosis, resulting in severe mucocutaneous blistering and epidermal detachment characteristic of SJS/TEN.
Increased incidence of life-threatening SJS/TEN, with symptoms including fever, rash, mucosal erosions, and widespread skin sloughing; mortality rates up to 30-50% in severe cases, particularly in those with the allele.
Perform HLA-B*1502 genotyping before initiating carbamazepine in patients of Asian descent
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