Use Of Valparin Crono 300

my 10 years son born birthasphasia suffering apilapsy since last 3years he have taken valaprine crono-300 but after his last attack of seizer on october-2011 doctor added zonox300.When it again attacked the doctor changed it to 450. Now my son is taking valparinecrono 300+zonaxa 450. It seems me that my son feels drowsy and abnormal state of mind. In view of the above request you to suggest us for my necessary further action for the sake of my son.

My son who is 14+ took double dose of valparin crono 300 which he is supposed to have once a day. As the dose is being reduced by the Dr. Pl. Tell what are the effect if the dose has been taken twice.