The tablets, a type of tranquilizer, which when taken without prescription can have serious toxic effects, had been sent from Austria.
A 59 year-old male was arrested by Gardai and detained at Henry Street Garda Station, under the provisions of Section 2 of the Criminal Justice (Drug Trafficking) Act 1996.
However, the male was released without charge and a file is being prepared for the DPP and investigations are continuing.