new caution about using phenytoin (Dilantin, etc) or fosphenytoin (Cerebyx) in certain patients of Asian descent

You'll hear a new caution about using phenytoin (Dilantin, etc) or fosphenytoin (Cerebyx) in certain patients of Asian descent.

This is similar to the recent warnings for carbamazepine.

The FDA now recommends testing for the HLA-B*1502 gene before starting carbamazepine in Asians.

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