> Adderall is notably different in SR and XR varieties as well; SR is a short intense spike that lasts 2-4 hours, whereas XR works after an hour and a half and

> Adderall is notably different in SR and XR varieties as well; SR is a short intense spike that lasts 2-4 hours, whereas XR works after an hour and a half and keeps rolling for 5-9 hours, depending on food/caffeine intake. I take XR in the morning and another XR or IR as needed in the afternoon and evening, they're not exclusive. Works great for those really long days when a few hours doesn't cut it, and it's a common ground between the XR lasting long (not quite as intense though) and the short spikes from the IR version.