What do they want? They are old enough to have input about this. Are their symptoms manageable? Are they able to make these kinds of decisions on their own to some extent? If so, why not let them speak to their doctors, discuss the pros and cons, and make that decision for themselves? It's different if their symptoms are severe, causing them to act out, creating problems in school, putting them or others in danger. At that point they probably need to have some of this decided for them, but as much as possible, give them a voice in this decision.