Determination of lamotrigine in small volumes of plasma by high-performance liquid chromatography

Ching Ling Cheng, Chen Hsi Chou, Oliver Yoa Pu Hu

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64 Citations (Scopus)


Lamotrigine is a broad-spectrum antiepileptic agent. This study describes a simple and sensitive high-performance liquid chromatographic method for the determination of lamotrigine in 50 μl of plasma. Lamotrigine and the internal standard guanabenz were extracted with 1.2 ml of diethyl ether, after the samples alkalinized with 10 μl of sodium hydroxide solution (1N). Chromatographic separation was achieved on a silica column with the mobile phase of acetonitrile-water containing 0.2% phosphoric acid and 0.3% triethylamine (pH 2.7) (84:16, v/v), at a flow-rate of 1 ml/min. The eluant was detected at 225 nm. The retention time was about 6 min for lamotrigine and 7 min for guanabenz. No endogenous substances and concomitant anticonvulsants were found to interfere. Calibration curves were linear from 0.1 to 5 μg/ml. The relative recovery of lamotrigine averaged about 80%. The limit of quantitation was 0.1 μg/ml. The intra- and inter-day precision (expressed as coefficient of variation, CV) was 8.1%, or less, and the accuracy was within 11.5% deviation of the nominal concentration. The method is suitable in pharmacokinetic investigation and monitoring lamotrigine concentration.

Original languageEnglish
Pages (from-to)199-206
Number of pages8
JournalJournal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences
Issue number2
Publication statusPublished - Mar 25 2005
Externally publishedYes


  • Antiepileptive
  • HPLC
  • Lamotrigine
  • Pharmacokinetics

ASJC Scopus subject areas

  • Biochemistry


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