Drug safety organisation The Loop has issued a warning about yellow 'Super Mario' pills containing N-ethylpentylone.
One was tested at Boardmasters in Cornwall at the weekend, with The Loop saying the substance can cause paranoia and insomnia.
Yellow Supermario pill containing N-ethylpentylone tested at #Boardmasters2018. May cause severe insomnia and paranoia. The pill was bought in Cornwall so more may be in circulation. #LoopAlert #TimeToTest pic.twitter.com/DsLvO1HY0m— The Loop (@WeAreTheLoopUK) August 11, 2018
N-Ethylpentylone, which can also cause increased body temperature, anxiety and agitation, has also been in circulation in New Zealand.
Be sure to read this and watch the video below for information about safer MDMA and ecstasy use.
Dave Turner is Mixmag's Digital News Editor, follow him on Twitter