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I have different opinion.
Yes it is possible to have zero with one of the results likely keppra.
Keppra and dilantin interact with each other.
Dilantin can cause faster metabolism of keppra.
And if the level was taken about 8 hours after the last dose, then the level may not be detectable.
If you do not have any seizures, then this may not be important.
But if you had seizure, then that means the dose needs to be increased after discussing with your neurologist.
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