If you're going to try it, consider following a similar procedure here before you commit to it since it's rather expensive compared to other enhancers: http://www.gwern.net/Nootropics#adderall
However, there's a massive difference between instant release (IR) and extended release (XR) Adderall pills. The body is effective at downregulating pharmacological peaks as they happen, so IR is less effectively potent than XR. For example, for me, a 20mg XR lasts longer with greater effects than an entire 40mg IR pill rationed apart and taken within 4 hours.
I'd go as far as to recommend against IR amphetamine. The peaking of IR doses builds tolerance incredibly fast. I'd place XR amphetamine on a different plane entirely.
If anyone isn't having success with IR, I recommend XR.
Finally, prescription amphetamine is dirt cheap with insurance. I don't have script drug insurance and pay $160 for 30 pills of generic 20mg Adderall XR. With insurance, it's a mere $12 for a month's worth.
If anyone isn't having success with IR, I recommend XR.
SWIM[0] (who couldn't get IR) didn't get much lasting value from XR, because it took too long over the course of the day, but discovered that opening the caplet and crushing the contents before ingesting made for a bigger immediate kick. SWIM also found it hard to find a consistent optimum dosage this way, but experimenting has been helpful.
Well, we're talking about therapeutic use, here. I think upping an XR dose (no more than 30mg XR) would be more effective than crushing pills and bumping them for an "immediate kick".