I find piracetam to provide effects immediately, but it also achieves greater effects when taken daily for a couple of weeks. Strangely, after a while it starts to get slightly detrimental rather than beneficial, so when I take it I cycle it a couple of weeks on, a couple of weeks off. I haven't had piracetam in quite some time though. It's very subtle but I notice it for sure, especially when I'm doing something mentally taxing and/or multi-tasking. Also, I feel like you have to actually learn to recognize and utilize the effects. So the first times you take it you might not notice anything.