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HLA-B*1502

Carbamazepine is used to treat all types of partial seizures and generalized tonic-clonic (grand mal) seizures. Brand names include Tegretol and Carbatrol. Generic versions are also available.

Common side effects include drowsiness, headache, dizziness, blurred vision, difficulty in thinking, double vision, diarrhea, nausea and vomiting. Approximately 10% of patients may develop allergic skin rashes.

Asian patients have more than 1000 times the risk of developing severe cutaneous reaction syndromes (SCARS), which are also known as Stevens-Johnson syndrome and toxic epidermal necrolysis. Complications may include sepsis, multiple organ failure and death.

An allele of the human leukocyte antigen B type, HLA-B*1502, is a genetic marker for carbamazepine induced SCARS in Asians. In December 2007, the FDA changed the prescribing information for carbamazepine to include screening at risk patients for the presence of HLA-B*1502 prior to initiation of treatment.
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