Hm...now you mention it, you are right. Might just have to order some more pramiracetam. Its much more expensive than piracetam, but a fucking load more effective.
Out of the lot, I've tried piracetam, pramiracetam and aniracetam, piracetam was the cheapest, helped quite a bit, but a lot less effective compared to either aniracetam or pramiracetam.