"OP - I wouldn't advise a teenager to take AD."
May I qualify this a little?
I absolutely agree that ADs should never be the first port of call for teenagers, but there are teens who need them, either because other treatment isn't working or because they are too ill to focus on any treatment such as CBT without them. My dd was one of them. There was no way she could take charge of herself or anything else, she was struggling to eat or get out of bed. CAMHS tried everything and nothing made any difference until she went on the medication. I fully understand why they tried everything else first: they did right given her age, but it was a scary time.
She is now a thriving young adult, still with MH problems, but under control. Far from being numb, she has become the lively, bubbly, enthusiastic young person she was obviously meant to be. She says herself that the illness made her numb and the ADs have given her back the connection to her feelings. She is studying on an extremely demanding course (physical theatre) and despite physical disability is coping extremely well with any setback. She uses the CBT techniques she learnt from CAHMS all the time, takes plenty of exercise and eats healthily, so it's not just a question of popping a pill to avoid doing those other things.
She tried to come off the ADs a year ago, but became very ill again. She now accepts that she would rather be alive on medication than risk suicide without it. Because for her, that is basically the choice. Not ideal, but better than what would be the alternative in her case.
If I had refused to let her go on them or talked her out of it, I fully believe she would be dead by now.
So I would say, I would support the doctors in exploring every other avenue first. But if nothing else works, and if they think ADs are the way forward, then I would support that too.