Seven people have been arrested after three separate drugs hauls, with a combined total of over €6.8m.
More than €4m worth of heroin has been seized in Co Louth while cocaine with an estimated value of €2m was found in south Dublin.
€500,000 worth of drugs were also discovered in Rosslare Europort.
An articulated truck was stopped and searched on the M1 near Drogheda last night. It was found to contain 27 kilos of heroin, worth €4.05m.
A 40-year-old man and 43-year-old woman were arrested at the scene, while another man - also 40 - was detained in a follow-up search.
Separately, two men were arrested following the discovery of 32 kilos of cocaine worth €2.24m at a house on Stillorgan Road in Donnybrook in Dublin.
Two men aged 27 and 37 were arrested at the scene.
Finally, officers from Revenue seized 2.7kgs of heroin, ecstasy tablets, cannabis resin and a quantity of LSD tablets at Rosslare Europort.
They were concealed in the fuel tank of a UK registered vehicle that had disembarked a ferry from Cherbourg after sniffer dog Ralph gave an indication.
The two occupants, a 40-year-old from Scotland and 34-year-old were arrested and are currently being questioned at Wexford Garda Station.