From what I remember, 60mg of XR is pretty high. I don't think most doctors will even write scripts for that much. Xr is long acting and Ritalin is not, so you may be taking two separate doses throughout the day. The long acting version of ritalin is concerta. Your on such a high dose of adderall that you proably have a high tollerance to the stuff so a doc won't write a script for the exact equivalent of 60mg of ritalin. I would say mabye 30mg of ritalin? Your doc may be willing to give you a bit more. Your on such a huge dose it's hard for me to say. If your gonna be taking concerta I would say mabye 72, or 90?