Benzylpiperazine
Adverse effects have been reported following its use including acute psychosis and seizures. It does not appear to be very addictive and no deaths have been reported following taking BZP once. There have been at least two deaths  which resulted from the combination of BZP and MDMA. Its sale is banned in a few countries, including the United States, Australia, New Zealand and in parts of Europe. However, its legal status is currently less restrictive in some other countries such as Ireland and Canada. The European Union is currently changing its laws to regulate this substance more.