Meds | ADHD Information

I have recently started taking adderal XR 20mg/ once a day, around 6pm I become very tired, so I take 10mg of ritalin. Would it be recommened to overlap adderall XR with ritalin, I know adderall XR is suppose to last all day, but i become so exhausted by late afternoon? Has anyone had any experiences with overlapping ritalin 10mg, with adderall XR?

I also take adderal XR 20mg.  If I take it by 7:00 then I take a regular adderal, 10mg at about 5:00.  That's only if I have things to do in the evening that require sustained attention, like classes, homework, ect.  Some days though, I don't take my XR untill around 11:00 am, so then I don't take anymore that day. 

 It's hard for me to tell if I've ever overlapped them .  It's a pretty low dose, so if it overlapped a little I don't think it would hurt.  With meds its all about trials; see what works, doesn't work; try something else.  The dosage and timing of the meds have to be taylored specifically to you as an individual.