Drugs with an estimated street value of 60,000 euro have been seized during a raid.
Herbal cannabis, LSD and cocaine were discovered during the search of a house in the Rathfarnham area of south Dublin on Friday night.
Earlier, two men in their 20s were arrested when gardai from the Terenure District Drug Unit stopped a car on Leinster Road, Rathmines and found a quantity of cannabis herb and LSD.
One suspect is due to appear in court charged in relation to the drugs haul.
A Garda spokesman said the second man had been released without charge