The drug is similar to speed, ecstasy and cocaine, with some people finding it hard to sleep for days and lose their memory.
Drugs worth half a million Euro have been seized in Newbridge.
An 18-year-old man has been arrested in connection with the seizure.
He is due in court this morning at 10.30am.
Revenue officers seized 10.19kgs of the synthetic drug Mephedrone.
The drug is similar to speed, ecstasy and cocaine, with some people finding it hard to sleep for days and lose their memory.
It can also cause hallucinations, nosebleeds and even fits.
The drug gives some people a false sense of confidence, but it can also cause paranoia and agitation.
The seizure was a result of a joint operation conducted by Revenue’s Customs Service, the Garda National Drugs and Organised Crime Bureau and the Newbridge Drugs and Crime Unit.

Tractor Convoy To Reach Naas At Around 11am As Irish Farmers Head For EU Protest
29 New Jobs To Be Created As Chemist Warehouse To Open In Naas Tomorrow
Vulnerable Adults, Some Using Wheelchairs, Forced To Share Inaccessible Vehicles At Kildare HSE Service
“Grabbed By the Neck”: Founder Tells Kildare Today Why She Launched New Female-Focused Taxi Service
Just 75% Of Landowners On Board So Far As Uisce Eireann Submits Plans For Major Water Supply Project
Two Kildare Animal Charities Share €170k Fund As Animal Welfare Costs Continue To Mount
Call To Make Extended Christmas Train Timetable Permanent For Commuter Towns
Roadside Memorial Ban Proposal Criticised Over Christmas Timing