Revenue has confirmed that drugs worth over $2.2 million have been seized at Dublin Airport and Rosslare Europort.
A man in his 20s has been remanded in custody, and will appear before the court on October 25th.
He arrived in Dublin on a flight from Dubai last Saturday and is charged with importing heroin worth €1.8 million.
In a separate operation, a UK registered SUV was stopped and searched as it arrived in Rosslare from Cherbourg.
Cannabis resin worth an estimated street value of €403,000 was seized, and a man in his 40s was arrested.
Investigations are ongoing.