Ive been prescribed Adderall XR 30mg for many years and i have a high tolerance so i usually have to take 2 sometimes 2 and a half pills for it to be effective. I try and skip a few days here and there but still i always run out early. So i was wondering would switching to Adderall IR 30mg twice a day be better for me? Also what's the highest dosage for Adderall IR? My psychiatrist told me 30 mg or XR is the highest dose so i wonder if it's the same for IR.