losing effects after 2-3 hours?

[pyschidelicmann]

ok well i took 20mg IR adderall about 5 hours ago. i used it for some schoolwork but i was a little dissapointed because ive realized that when i take adderall lately (IR), i get really hyper and talkative and normal adderall effects, until about 2 or 3 hours later, then i just feel sorta tired, yet sorta feeling it inside. definately not the motivation and energy i had before. when i used to take it i could feel like that almost all day, now its just 2 or 3 hours. what happened? how can i make it stay like that how it used to?

i have XR, that just lasts too long sometimes, which is why i use IR if i take it after noon or so.

i thought it might be a tolerance issue, but i havent taken it in 4-5 weeks so i dont think that would be a factor?

any help?

thanks