Journal
EPILEPSY RESEARCH
Volume 87, Issue 2-3, Pages 124-129Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.eplepsyres.2009.08.004
Keywords
Epilepsy; Pregnancy; Topiramate; Pharmacokinetics; Therapeutic drug monitoring
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Funding
- Stockholm County Council
- Karolinska Institute
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Purpose: To study the effects of pregnancy on plasma concentrations of topiramate (TPM). Methods: An established routine fluorescence polarization immunoassay (FPIA) method was used to determine TPM concentrations in 15 women with epilepsy treated with TPM during altogether 17 pregnancies. Results: In 10 pregnancies, where samples were available from all three trimesters, the mean TPM dose/concentration ratio (D/C-ratio) was significantly higher than outside pregnancy baseline value 37.3 L/day (+/-15.9), during the 2nd, 67.5 L/day (+/-23.4), and the 3rd trimester, 65.1 L/day (+/-30.4), but not during the 1st, 49.4 L/day (+/-29.4). Including seven additional pregnancies enrolled late with data only from the 3rd trimester, the mean D/C-ratio during the 3rd trimester was 67.4 L/day (+/-27.5) compared to baseline, 38.8 L/day (+/-18.0), an average increase by 71.8%. There was a pronounced intra-individual variability in alterations in D/C-ratios during pregnancies. Conclusions: Our data show a significant pregnancy-related increase in D/C-ratios of TPM suggesting that therapeutic drug monitoring might be of value. (C) 2009 Elsevier B.V. All rights reserved.
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