Re: Adderal wearing off and feeling tired
Four hours seems in line with what most people experience with Adderall XR. Despite the fact that it's supposed to work for 8-12 hours, that's simply not what most people get.
It would certainly not be out of line to suggest to your doctor that you take your Adderall twice a day. If you're an American, you could suggest he prescribe IR twice a day (we Canadians don't have that option, only having access to XR), or you could ask for an increase in dosage, to see if that helps; 20mg is on the lower end of the spectrum.