i suggest you tablet folvite 5 mg of folic acid one tablet per day. the recommended dose of folic acid is a controversial topic. various doctors favor 1 mg to 5 mg per day. the best part is that the folic acid has no side effects. it is a water-soluble vitamin and an excess of it gets excreted in urine. so we recommend 5 mg per day to all our patients. when sufficient dose is harmless there is no need to take a chance by giving low doses. one more concern of mine is that you have to check with your neurologist if it is safe to go ahead with pregnancy while on lamictal (lamotrigine). the safety of lamictal is not established by studies. but if your physician has good experience with personal case series then i think you can continue. for further information consult a neurologist online --> <link>
what is the recommended dose of folic acid while planning for pregnancy?