been ever so slowly increasing my dose from 5mg xr to 15mg over three months and about to try 20mg next which i have had good experiences with when i was self-medicating here and there with non-prescribed generics   i stopped noticing useful effects each month a few days in and less ability to focus im hoping its just a dosage issue and not a matter of being on the wrong meds ive been taking mini med vacations because of it and it hasnt been great fingers crossed