Some €500,000 worth of BZP tablets were recovered by gardaí during a search in Dublin yesterday.
A man in his 50s was arrested during the raid in which gardaí also seized some €70,000 worth of cocaine.
Gardaí searched a house in the Bridewell area of north Dublin city at about 3pm.
The man arrested at the scene was last night being held at Store Street Garda station.
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The search was part of an ongoing Garda operation into the sale and supply of controlled drugs.
BZP, or benzylpiperazine, is a synthetic mood-altering drug.