My daughters psychiatrist started her on 25 mg and gradually increased the dose by 25 until she reached her current dose of 300 mgs per day.. Subsequent reading on the matter has also indicated that that is the usual procedure with lamectal. My daughters new psychiatric wants to increase her dosage but is still gradually doing so by increasing it 50mgs every two weeks. Perhaps your family Dr feels it is okay to start your son out on a higher dose since he did not have any reactions to the medication previously. If you are not comfortable with your family Dr's scrpt maybe you should consider consulting a psychiatrist or ask him why he is ordering the current dosage when everything you've read indicates a lower dosage.