Police have warned drinkers in Tameside to be on their guard after a rise in drink-spiking.
And, in some cases, people have suffered an accidental overdose after their drinks were tampered with.
A police spokesman said: "We've seen an increase of overdosing due to use of recreational drugs in the Tameside area. Please remain vigilant when out drinking!
"You can report spiking or spiking-related offences via our website. As well as the reporting form, there is advice and information to help you or someone you know who has been affected by spiking."
Over recent months, Greater Manchester Police (GMP) officers, in collaboration with the Crime Prevention Team, have distributed spiking and personal safety kits in the night-time economy.
Officers distributed kits that included spiking prevention covers, foil lids, informational leaflets, and personal attack alarms.
GMP also urges women to report instances of catcalling, harassment, sexual assault, or sexual violence.
Det Chief Supt, Neil Jones said: "I want to assure our communities that our officers are working tirelessly to ensure victims are safeguarded, providing committed and thorough support whenever and wherever it may be needed across Greater Manchester.
"We want everyone to enjoy this time of year and feel safe in doing so.
"Our commitment extends beyond visible presence in busy hotspots with bars and clubs; our officers are dedicated to addressing all complexities of this time of year. Whether it's in the city centre, a residential neighbourhood, or any corner of Greater Manchester, our officers are there for you."