The drugs were discovered during a search in Ballaghaderreen
Drugs worth an estimated €35,000 have been seized in Co Roscommon.
Revenue and gardaí carried out a joint operation at a residential address in Ballaghaderreen earlier today.
They discovered a package containing around 500 grams of cocaine.
Revenue says the drugs originated in Chile.
A foreign national, aged in his 40s, has been arrested in connection with the investigation.
He is being held at Castlerea Garda Station under the provisions of Section 2 of the Criminal Justice (Drugs Trafficking) Act 1996