Hello Welcome to HCM You are in reproductive age group and are a known case of epilepsy. You are currently on carbamazepine 400 mg per day. Previously you were on sodium valporate and it caused increased weight in you so you stopped medicine and again developed seizure after 1.5 years. See any drug taken during pregnancy may harm developing fetus. There is risk to fetus and risk of developmental malformations in fetus with most of anti epileptic drugs. The risk is with valporate, phenatoin, carbamazepine etc. But carbamazepine has lower risk than other drugs. It can be taken if you are planning for pregnancy. Weight gain may occur with it but risk is more or less equal or less than valporate. Also start taking Folic Acid tablets at least 4 mg per day as it will reduce the risk of neural tube defects in developing fetus. Thanks Dr. Seikhoo Bishnoi, MD