I have the same problem I'm ** (200lbs) and every morning I take 2 capsules of adderall xr one is 30 mgs and the other is 10 mgs and yet it barely lasts till 4th hour so now my doctor is thinking about making me take adderall xr 2 or 3 times a day and I can barely sleep now so shes got me on 0.1 mgs of clonidine too. How much more can one person take.