When I first got prescribed my Adderall, like a year ago.. I used to fuck around with my dosage, 20mg a day, just to see how it felt to take more... I got up to like 60-70mg, or somewhere around there, of Adderall IRs, and I didn't even like it... I felt way too speedy, tweaked, and just all around uncomfortable! Even with my daily dose of klonopin with it, to help my anxiety.. I have been much happier in the 20-30mg range since that time I took too much... my prescribed 20mg a day dose, does me just fine! and I have built up a tolerance... even with the tolerance I still feel much better, happier, and more ADHD free, on my 20mg dose, with the occasional extra 10mg on top... no more than 30mg for me tbh, I prefer Adderall at a lower dose... its strange, but that's how I feel and that is my opinion on it! Take less OP, see how you feel... its not fun in my opinion, to be all "tweaked" feeling, and not get any sleep for days... I hate that feeling honestly.