What are the indications of an abnormal phenytoin serum level?


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What are the indications of an abnormal phenytoin serum level?


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SS, a 26-year-old woman, takes phenytoin 100 mg t.i.d. to control grand mal seizures. SS and her husband are contemplating starting a family. SS complains of frequent “upset stomach” and “bleeding gums” when brushing her teeth and is questioning if other anticonvulsants are more appropriate than phenytoin.

What are the indications of an abnormal phenytoin serum level?