'If people feel unwell, they should seek medical help immediately, rather than waiting to see if the effects wear off after sleep and re-hydrating. '
Officers in Leicestershire have released advice as green pills, similar to those in the picture below, have been associated with a number of recent deaths and hospitalisations.
The warning is about counterfeit Oxycodone – Nitazene.
Leicestershire Police said: "We encourage people not to take these pills even in small amounts, and to consider the potential harm of taking any pills.
"If people feel unwell, they should seek medical help immediately, rather than waiting to see if the effects wear off after sleep and re-hydrating.
"At this time there have been no reports in Leicestershire but it is important that people attending events this weekend are aware of the risk."

Image released by Leicestershire Police
Meet the landlord set to take over an historic village pub after seven years of closure – and why he ‘absolutely fell in love’ with it
Changes to Fosse Park approved
Fridges and freezers can be taken to Warwickshire recycling centres again
Extra police patrols coming to market towns
Woman in her 70s loses thousands in courier fraud scam
Leicestershire parents vote to keep October half term
Airport apologises over data breach
Hinckley baby creates five generations of women in one local family
