My son has ADHD and has gone through all of the stimulant medications without much success so we decided to try him on Strattera to see if that would work any better. He has hit the 3 month mark with it but I feel he has become quite negative so I have taken him off of it and have gone back to using Vyavance 30 mg as this worked the best out of all the others. This week he has been complaining of not feeling well and has vomited a couple of times, so I was just wandering if there are any side affects when coming off Strattera and how long does it take before it is out of the system?