Physiological-based Pharmacokinetics Approach to Medication Exposure During Pregnancy and Breastfeeding

The goal of this study is to develop modeling of pharmacokinetic changes for Antiseizure medications (ASMs), lamotrigine (LTG), and levetiracetam (LEV) during pregnancy and postpartum that can be used to:

• Adjust doses in practice without obtaining frequent visits to the lab for therapeutic drug monitoring.
• Predict exposure of ASMs in mothers and their infants in order to maintain the individualized target concentrations, thus protecting mothers from seizure worsening and minimizing fetal toxicity.

Hypotheses:

• Drug concentrations obtained in preconception and early pregnancy predict clearance changes throughout the remainder of pregnancy for individual pregnant women with epilepsy.
• Validated model allows the prediction of drug concentration changes at all stages throughout and after pregnancy, which will more accurately predict increased seizures and medication side effects.

Additionally, pilot data will be obtained for oxcarbazepine (OXC) in a small number of participants and contribute to data for ASMs that undergo glucuronidation (LTG).

Inclusion criteria

• Woman with epilepsy between the ages of 18-45 planning pregnancy or in the early first trimester of pregnancy.
• Women with epilepsy ability to maintain a daily medical diary
• Women with epilepsy ability to answer side effect questionnaires
• Women with epilepsy currently being treated with lamotrigine (LTG) or levetiracetam (LEV) or oxcarbazepine (OXC)

Exclusion criteria

• Women with epilepsy having history of functional seizures.
• Women with epilepsy history of other major medical illnesses including renal or hepatic disease, progressive cerebral disease,
• Women with epilepsy who have inability to maintain a seizure and medication daily diary
• Women with epilepsy with present or recent history of drug or alcohol abuse, or the use of any concomitant medications that interact with the ASM they are taking (lamotrigine, levetiracetam, oxcarbazepine).