With Mad Friday just around the corner , Brits are being warned to keep their wits about them at this year's Christmas parties.
That means monitoring your alcohol intake and drinks others may have had access to.
Hundreds of people fall victim to drink spiking in the UK every year.
While it's sometimes meant as a prank, it's often a precursor to sexual assault – and it's always illegal.
Spiking involves someone slipping alcohol or a drug into someone else's drink without their knowledge. The most common drugs used are ketamine, tranquilisers and gamma-hydroxybutyrate and gamma-butyrolactone, according to the NHS .
While there's always a risk of it happening in any situation involving beverages, it's more likely when there's lots of heavy alcohol drinking going on.
Alcohol education charity Drinkaware said the festive season is when Brits need to be very wary of drink spiking, and that means keeping a clear head.
"There is no need to drink to excess to be merry this Christmas," spokeswoman Jennifer Walters told Daily Star Online.
"In fact drinking too much alcohol can lead to all sorts of mishaps and dangers, including damaging your health and increasing the risk of drink-driving incidents. Because it lowers your inhibitions, drinking too much can also make you vulnerable to things like drink spiking."
The statistics around Christmas alcohol abuse are sobering.
"Two-thirds of drinkers in the UK admit to over-indulging with alcohol over the festive season," Ms Walters said.
"This means literally millions of people will be drinking more than the recommended guidelines of 14 units of alcohol each week. Plus, more than one in ten admit to avoiding social occasions because they feel pressure to drink at this time of year."
To keep Christmas safe and enjoyable, Drinkaware encourages Brits not to rely on alcohol to have a good time.
"There are so many ways to drink less and still enjoy the season, for example, trying low - or alcohol-free - drinks if you're out with friends, family or colleagues.
"As you wind down for the start of the festive holiday on Friday, we'd encourage drinkers not to let over-indulgence ruin the fun."
Also sounding the warning bell ahead of the silly season is Greater Manchester Police, which has developed a special "well-rounded" plan for the Christmas and New Year period.
Mancunians tend to be among the rowdiest Brits when Mad Friday rolls around, as photos of celebrations past have shown.
Superintendent Chris Hill said the GMP expects to see large crowds of revellers over the next two weeks.
"The Christmas Markets, planned events at the numerous sporting and music arenas, office Christmas parties and fireworks on NYE all add extra footfall to the already busy City centre," he told Daily Star Online.
"My officers will be working collectively with organisations such as St Johns Ambulance, Village Angels and Street pastors to name a few to keep everyone safe.
"We would like to remind everyone going out over this period, stay with friends and never go off alone, keep your valuables out of sight and always arrange how you will get home after a night out."