Abstract
A high-performance liquid chromatography assay with ultraviolet detection was developed for the simultaneous determination of the anti-epileptic drugs lamotrigine, carbamazepine and zonisamide in human plasma and serum. Lamotrigine, carbamazepine, zonisamide and the internal standard chloramphenicol were extracted from serum or plasma using liquid-liquid extraction under alkaline conditions into an organic solvent. The method was linear in the range 1-30 microg/mL for lamotrigine, 2-20 microg/mL for carbamazepine, and 1-40 microg/mL for zonisamide. Within- and between-run precision studies demonstrated coefficient of variation <10% at all tested concentrations. Other anti-epileptic medications tested did not interfere with the assay. The method is appropriate for determining lamotrigine, carbamazepine and zonisamide serum or plasma concentrations for therapeutic monitoring.
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