lots of confusion about when to test drug levels in patients taking anticonvulsants

There's lots of confusion about when to test drug levels in patients taking anticonvulsants...phenytoin, carbamazepine, phenobarbital, or valproic acid.

A recent survey suggests fewer than one-third of these tests are appropriate...and half of these are taken at the wrong time.

Anticonvulsant levels can be checked whenever toxic or subtherapeutic levels are suspected. But tests to monitor changes in

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