Lamotrigine and its N2-glucuronide during pregnancy: the significance of renal clearance and estradiol.

Purpose: To investigate the physiological mechanisms behind the pronounced decline of lamotrigine (LTG) serum concentrations during pregnancy.

Methods: Serum and urine concentrations of LTG and its main metabolite, LTG-N2-glucuronide (LTG-GLUC), were measured monthly in 21 pregnancies of 19 women using LTG. Simultaneously, a panel of biochemical variables was monitored to evaluate liver and kidney function and possible hemodilution effects. Pharmacokinetic parameters were calculated once at baseline and once in gestational month 8.

Results: Initially, LTG and LTG-GLUC serum concentrations fell simultaneously by 27% and 38%, respectively (gestational month 2). Subsequently, the ratio of the LTG-GLUC/LTG serum concentrations increased gradually, correlating strongly with rising serum estradiol concentrations. In gestational month 8, the ratio was 164% higher than at baseline. At that time, LTG total clearance had increased by 118%, and the amount of unchanged LTG in urine had dropped by 40% while the amount of LTG-GLUC had increased by a corresponding 37%.

Conclusions: The simultaneous decline of LTG and LTG-GLUC serum concentrations in early pregnancy suggests that in this phase, increased renal blood flow is the major cause. After gestational month 2, estradiol-induced glucuronidation of LTG becomes more important, leading to a further fall of LTG serum concentrations and a gradual rise of the LTG-GLUC/LTG-ratio through the remaining pregnancy. An expanded volume of distribution may also contribute to reduced LTG serum concentrations in pregnancy.