Gardaí have dealt with 497 reported incidents associated with the Electric Picnic festival, which was held over the weekend at Stradbally in Co Laois.
453 incidents related to drugs offences while six were public order offences during the three-day festival.
There was one minor assault and one theft.
One male was arrested in possession of an offensive weapon.
Four arrests were over driving while under the influence of an intoxicant, three of which were related to drug driving.
Meanwhile two people were admitted to the Midland Regional Hospital in Portlaoise suffering from the effects of drugs and alcohol and have since been "stabilised".
Gardaí are also continuing to investigate one sexual crime which was reported during the festival.
Increase in numbers taking tents home
The organisers of the festival have said there was an increase in the number of people taking their tents home this year.
Those attending the festival were urged not to dump their tents after a single use.
This year's festival also included a 'clean campsite' named Greta's campsite after the environmentalist Greta Thunberg.
Those who kept their camps clean and used dedicated recycling stations were given the chance to win tickets for next year's festival.
Organisers thanked those attending the festival and volunteers who worked to encourage zero waste.