My DD1 is 23 tomorrow...and still on meds (Ritalin for ADHD and also Prozac for anxiety)
She was on them from 6- 13, came off for couple of years but then went back on them (her choice)
I'm guess she is the one Poltergoose has mentioned, as she is in her final year of medical school , and unbelievably will be a doctor this summer!
It hasn't all been plain sailing, but I have no doubt that without the meds she could not have functioned, let alone got where she is now. She was always skinny and the meds didn't really change that. However she was not treated for her anxiety until she was 19, and after a hideous homesick first year at Uni, she became anorexic... came home weighing 5 stone 9 (and she is 5 ft 10)... it was truly awful, but the Ritalin ahd nothing to do with it, it was her untreated anxiety that spiralled out of control.
However, she had help, her anxiety is now under reasonable control and her body weight is normal (still skinny but ok BMI) and she is carefully monitored and supported at Uni..they have been fabulous all the way.
I think meds are worth a try, but please ensure they look at all aspects of her medication, anxiety is terribly disabling, at least as much as ADHD.
Incidentally my DD1 is in the process of being reassessed as they feel she may have bipolar disorder rather than childhood-into adulthood ADHD. Which makes sense to me as she has huge highs and huge lows and at times her impulsive behaviour has put her at risk to herself.
On the plus side, having these difficulties herself and a disabled brother, she is SO much more empathetic and knowlegeable about special needs than your average junior doc is ever going to be !!!!