Piracetam is said to increases the effects of alcohol and amphetamines. No other drug interactions have been noted. It is recommended that alcohol be avoided as one of the reported effects of Piracetam is increased flow of blood to the brain which would increase damage and intoxication. This will vary form nation to nation. It is generally available through mail order.
Legal issues exist.
This section is organized by country. Untied States Piracetam has not been approved by the FDA for use in the United States. This does not mean that it is illegal. It is legal to use, posses, and import Piracetam on a 'personal use' bases. I think it covers the various elements of legality like 'serious conditions' and 'personal use'.