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  • Title: Effects of pregnancy on the pharmacokinetics of lamotrigine in dogs.
    Author: Matar KM, Nicholls PJ, Tekle A, Bawazir SA, Al-Hassan MI.
    Journal: Epilepsia; 1999 Oct; 40(10):1353-6. PubMed ID: 10528929.
    Abstract:
    PURPOSE: This study was designed to evaluate the effects of pregnancy on the kinetics of lamotrigine (LTG). METHODS: Five pregnant dogs were given a daily dose of LTG (100 mg) for a period of 1 week. Two months after parturition, the same subjects were given the LTG dose (100 mg) over the same period. On both occasions, plasma LTG concentrations were determined by a sensitive, high-performance liquid chromatographic (HPLC) method, over a 30-h period after the last dose. RESULTS: The mean maximum plasma concentration (Cmax), volume of distribution (Vd/F), and oral body clearance (Cl/F) for LTG (+/- SD) during pregnancy were 7.63+/-2.46 microg/ml 1.74+/-0.29 L/kg, and 0.19+/-0.04 L/h/kg, respectively. After pregnancy, the same variables were 6.12+/-2.24 microg/ml, 2.36+/-1.10 L/kg, and 0.30+/-0.13 L/h/kg, respectively. None of these pharmacokinetic parameters was found to be significantly different between the two groups. CONCLUSIONS: The apparent lack of change in the relevant pharmacokinetic parameters of LTG during pregnancy may indicate that pregnancy has little or no effect on glucuronidation; the principal pathway for the drug's elimination.
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