It may be sold as Ecstasy but it's unlikely to live up to its name.
That's the warning to party-goers lining up illegal drugs for New Year's Eve dance parties.
They say anything sold as Ecstasy is more likely to have a range of active ingredients - but not the MDMA compound which made the drug a popular hit.
NZ Drug Foundation executive director Ross Bell said pills sold as Ecstasy were more likely to contain caffeine, methamphetamine, former legal party pill BZP or the stimulant mephedrone.
"If someone offers you Ecstasy, it is unlikely to be Ecstasy."