CDKL5 gene mutations are the cause of symptomatic infantile epilepsy in some patients. Such patients present with partial seizures and characteristic hand movements that are often observed in patients with Rett syndrome. This clinical entity has recently been recognized as CDKL5 disorder. In a girl with CDKL5 disorder, who had been treated with combinatory therapy using many anti-epileptic drugs, we were able to control the seizures with valproate monotherapy. As a result of the monotherapy, the patient’s seizures ameliorated temporarily and her quality of life improved. Some patients show improvement in seizures during the natural course of CDKL5 disorder. Therefore, there is a possibility that this was also the case in our patient. However, the patient and her family were satisfied with the improvement in quality of life after the withdrawal of the multi-drug combinatory therapy. Thus, it is important to select the best therapy for patients with intractable epilepsy through long term follow-up.
