The purpose is to study the population pharmacokinetics, effectiveness and safety of antiepileptic drug (phenytoin, carbamazepine, lamotrigine, levetiracetam, parempanel, etc) in elderly patients and recommend optimized dosage regimens.
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The peak plasma drug concentration of antiepileptic drugs.
Timeframe: at (0-4) h after oral administration
The random plasma drug concentration of antiepileptic drugs.
Timeframe: at (4-10) h after oral administration
The trough plasma drug concentration of antiepileptic drugs.
Timeframe: at (1-2) h before the next administration