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Ketamine which has been 'contaminated' with a super-strength sedative used by vets is being sold in Manchester , drug users have been warned. Greater Manchester Drug Early Warning System said several batches of the drug tested in recent days were found to contain medetomidine, a potent veterinary anaesthetic commonly used on large animals.

Taking the mixture of the two drugs could be fatal, experts have warned. It's understood testing was carried out after one user raised concerns they had taken ketamine which 'tasted funny'.

The warning reads: "Medetomidine is similar to xylazine but 200 times more potent and longer lasting. The combination of ketamine and medetomidine is likely to result in extreme prolonged sedation and could be fatal.

"The combination of ketamine an

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