I was on 20 mg for almost 7 years before I increased it 10 mg. Based on my experience, I would stick with the 20 mg another 6 months. If you feel like you are drifting back into some old ADHD problems, then it might be time to ask you doctor for an increase. What I will tell you is that I was on Adderall for 10 years and the absolute worst thing you can do is to try to come off your medication cold turkey. I am going on almost 5 years without Adderall and I still miss it every day. I don’t feel like I am the “real me” without it. So yes, unfortunately there is an addiction side to Adderall.