Note, however, that an IQ below 75 falls in the bottom 5% of cognitive ability. I highly doubt that it's possible to infer impact of these drugs on individuals in the upper 5% of cognitive ability (exactly the folks that are the most interest in boosting their intelligence to stay competitive -- software engineers, medical/graduate students, etc...) from these studies.
Quick clarification: I am not claiming that Piracetam can't have any effects in healthy, mildly-to-moderately gifted individuals, it's just that I am not certain you can extrapolate from studies of Piracetam use with impaired individuals.
Finally there could be other benefits to Piracetam use (reduced anxiety, better memory, better focus, etc..) even if there's no "boost" to performance IQ.
I just don't (yet?) see conclusive evidence of this.
