Posted 20 April 2013 - 10:16 AM
All I can suggest is for you to read up on the substance as much as you can. There are studies available on pubmed that should give you a good idea of what effects it has. When coupled with subjective reports such as those you can find on this forum, you will get a decent overview of what to expect.
Obviously, if you still feel hesitant, that is alright. It wouldn't be worth the worry if you are anxious about side effects.
Anyway, what is very clear is that it will not have effects anywhere close to what the movie Limitless is portraying - there are no drugs that can provide that kind of thing. The closest would be modafinil, but I would never take that given that it is eerily close to an amphetamine.
I have not tried oxiracetam, but I have tried the following, and none of them have caused significant side effects, certainly none of them have caused cognitive impairment, quite the opposite. However, I have felt positive effects from some of these substances. Here's a short summary of the effects
Salmon oil (greater fluidity in thinking, reduce lethargy without giving a 'boost')
Cat's Claw (no perceived effects)
Mucuna Pruriens [Dopa Mucuna] (no perceived cognitive enhancement, 'tingly feeling' in body)
Piracetam (increased focus, boosted mood, great synergy with salmon oil, ginkgo biloba and caffeine)
Noopept (so far only a slightly spaced out anxiolytic feeling, no cognitive enhancement noticed except possibly slightly improved memory)
Aniracetam (pleasant mild anxiolytic effect, enhanced focus and energy)
Ashwagandha (mild, calm, clear-headed feeling, seems to help reduce fatigue)
Curcumin (improved digestion, skin... tasty when mixed with curry, coconut or olive oil (I use it as a bread spread instead of butter or margarine)
Centella Asiatica (Gotu Kola) (calming effect, levels mood, increased clarity of thought at the right dose, sedative at high doses)
Bacopa Monnieri (Brahmi) (no perceived effect)
Sulbutiamine (removes effects of not enough sleep, increased motivation, slightly increased libido and better focus)
Melatonin (does exactly what it is supposed to, i.e. makes you drowsy and helps induce sleep)
DMAE (increased energy and mood, but after reading reports and theories on how it acts in the body, I have stopped taking it, as it's not worth the risk if those theories are true)
Huperzine A (greatly increased brain transmission speed, possibly mood boost as well, but reports on risks make me not want to take this except on an occasional basis)
ALCAR (increased energy and endurance, improved mood, no perceived side effects - but a recent study reported negative effects on meat eaters and omnivores due to having different gut flora than vegetarians)