Piracetam has in a number of studies shown itself to be well tolerated with a very low toxicity. Figure out a dose regimen that seems to work for you. Play with when you take it whether its when you wake up, with meals, before bed, etc.
This isn't the board to get all into nootropic discussion in its general nature, but there are a number other things that facilitate its action. Nootropics and more specifically the racetam are a very fascinating rabbit hole. The next link is basically just a list of all the other relatives of Piracetam, many of them with great effect/side effect profiles for cognitive improvement. Do some research into them, its quite fascinating. 'it will help you to figure out what parts of the brain your playing with and you can figure out how to make it work better. A healthy diet and certain supplements, enough sleep, and doing activity that engages the mind in conjunction with these types of compounds should improve your memory over time. It might take time and you might not feel much different, but try to get a feel for how many fewer spacy moments you have.
http://en.wikipedia.org/wiki/Racetam
This is an interesting read, not necessarily one that is applicable at the present moment, but the possibility of mice with the ability to remember anything they see for a period of up to 14 months as opposed to an hour resulting from an over-expression of RGS14 is kinda fascinating when you realize that we also exhibit this gene that seems to have a profound effect on our ability to remember what we see....
http://www.alzforum.org/new/detail.asp?id=2182
Fascinating stuff though, compared to piracetam this sort of mechanism is pretty unexplored. There are a number of other derivatives that have differen't water vs lipid solubility. Some of them are a lot more immediate with shorter duration and others take days of taking it before you notice its effects but they stick around in your body longer.
I have not personally taken piracetam, but I believe it has a build in tolerance over time, I am not the one best suited to explaining these compounds but some of the things I do know is that your body with utilize it more effectively with a choline supplement.
If you experience a headache from taking piracetam, a choline supplement should be taken.
Look into hydergine and there are about a thousand others.
http://en.wikipedia.org/wiki/Levetiracetam
Speaking as someone that has taken this one as a prescription medication for its anticonvulsant action I felt that I would give my thoughts on it. I was supposed to double the amount I was taking at 2 weeks. Long before I reached that point I encountered quite a lot of its side effects despite being considered "well tolerated". Nothing about my body or mind liked this one in the least bit. From the pharmacy, before insurance the cost on enough for a month was something like 700 dollars per bottle.
Levetiracetam is, in general, well tolerated[6] but may cause drowsiness, weakness, unsteady walking, coordination problems, headache, pain, forgetfulness, anxiety, irritability or hostility, dizziness, moodiness, nervousness, loss of appetite, vomiting, diarrhea, constipation, and changes in skin color.
Im normally a pretty chilled out person, but I realized that I couldn't keep taking this much less take twice what I had been after I found myself hauling ass down the interstate at 90 miles per hour barely maintaining consciousness at the wheel while exhibiting dangerous levels of road rage for even the slightest thing. Massive dysphoria, irritability, hostility, aggression, it was hard to keep food down and nearly constantly dizzy.