Vitamin K deficiency may occur in pregnant women and the child after birth for women taking hepatic enzyme-inducing anti-epileptic drugs.
– Curr Treat Options Neurol 2002 Jan;4(1):31-40 — Epilepsy in Pregnant Women. — Bruno MK, Harden CL.



The combination of anitepileptic drugs and gabapentin generally results in synergistic or supraadditive interactions.
– Epilepsia 2002 Sep;43(9):956-63 — Effect of gabapentin on the anticonvulsant activity of antiepileptic drugs against electroconvulsions in mice: an isobolographic analysis. — Borowicz KK, Swiader M, Luszczki J, Czuczwar SJ.



Phenobarbital may reduce folic acid levels or absorption causing a deficiency.
– Clin Pharmacokinet 2002;41(8):559-79 — Treatment of epilepsy in women of reproductive age: pharmacokinetic considerations. — McAuley JW, Anderson GD.



Long term use may reduce calcium and vitamin D absorption.
– Clin Pharmacol Ther 1981 Oct;30(4):506-12 — Long-term anticonvulsant therapy and intestinal calcium absorption. — Wahl TO, Gobuty AH, Lukert BP.