Hi welcome to the health care magic Mitrazipine good drug that is useful in depression Let me know after one year how much improvement present in your child?? Usually medication for depression given for eight months If no improvement then further course prescribed The psychiatrist has examined your child and so he might feel that lamotrigine also required According to my opinion if it is depression condition and if improvement noted then one drug is enough You can discuss with your treating psychiatrist for deciding management plan Behavioural therapy Also beneficial Take care Hope your concern solved