Table 1

 Treatable metabolic causes of early onset epilepsy

Vitamin-responsive epilepsies
    Pyridoxine-dependent epilepsy
    Pyridox(am)ine phosphate oxidase
    deficiency (pyridoxal phosphate-
    responsive epilepsy)
    Folinic acid-responsive seizures
    Biotinidase deficiency
Other metabolic epilepsies
    Glucose transporter 1 deficiency
    Serine deficiency syndromes
    Creatine deficiency syndromes
    Untreated phenylketonuria