'ECSTACY' tablets sold in Mid Cheshire have turned out to be worming pills.
And police are warning anyone who may have bought the tablets not to consume them.
Forensic tests have revealed the pills seized in Northwich in April and believed to be ecstasy were in fact worming tablets.
Just one from around 100 recovered by PCs Leanne Huddart and Rob Astbury was ecstasy, with the rest worming tablet ingredients lactose and piperazine.
Side effects to the chemicals include abdominal pain, an itchy rash and diarrhoea. An allergic reaction could also cause narrowing of the airways, nausea and vomiting, dizziness, inability to coordinate muscles and drowsiness and confusion.
PC Huddart said: 'It's likely other people are in possession of these tablets, believing they are ecstasy. They look the same as the ecstasy tablet which was among the tablets we recovered and they have the same shark stamp on.
'The tests carried out clearly show they are not Ecstasy and I'd urge anyone who has tablets matching this description not to take them. Not only do they have side effects, they can cause even more harm if taken with other medication.'
The tablets were recovered after a man suspected of being in possession of Class A drugs ran off as he was being questioned by police in Belmont Road. He was pursued before being arrested.
A bag containing around 100 white tablets was recovered in the area and later searches of the suspects' home led to the seizure of a large amount of cash.
A 19-year-old man has since been charged with attempting to possess Class A drugs and will appear before magistrates tomorrow (Thursday).