I recently started back on meds. I used to take Adderall XR 50 mg. I cam currently taking Vyvanse 90 mg. I have read that you need a higher dose of Vyvanse. When I search for what the equivalent dose would be, I get mixed answers. Does anyone know if Vyvanse 90 mg is equal to Adderall XR 50 mg. When I took Vyvanse 60 mg, I felt that was not enough. This is why I increased to 90 mg.