A woman was left 'unable to speak clearly or stand' after she was reportedly spiked at an event in Manchester.
It is thought a man put something in the woman's drink at Warehouse Project on Friday night 22 October.
She was taken to the venue's welfare tent and treated by medical staff, a spokesperson for Warehouse Project has confirmed.
Police were called to nearby Travis Street at around 3:45am on Saturday morning to reports of a woman who believed she had been spiked.
A 27-year-old man was arrested on suspicion of administering a noxious substance, GMP confirmed.
He has since been released under investigation and enquiries are said to be ongoing.
Warehouse Project bosses are urging anyone who feels "unwell" or "unsafe" during one of their events to alert a member of staff immediately.
A spokesperson for GMP has urged anyone with information to contact them via LiveChat at www.gmp.police.uk quoting 545 of 23/10/21. Alternatively, details can be passed via the independent charity Crimestoppers on 0800 555 111.
It comes after a rise in the number of drink spiking across the country.
In the North West, the latest reports have come from Preston and Liverpool but there have been almost 200 across the country over the past two months.