Other adverse effects: on long term use include
hirsutism, coarsening of facial features,
megaloblastic anemia(treated with folic acid),
Vitamin D deficiency(rickets and osteomalacia),
vitamin K deficiency,
hyperglycemia due to inhibition of insulin release,
hypersensitivity and teratogenicity(fetal hydantoin syndrome; hypoplastic phalanges changes, cleft lip, cleft palate and microcephaly).