Up to €51,000 worth of drugs have been seized at Shannon Airport.
One kilogram of vacuum-packed blocks of Kratom, with an estimated value of €40,600, was found.
It was destined for an address in Co. Mayo.
Revenue officers also found €10,400 worth of Kratom, which had a Co. Tipperary address, which came in loose powder form.
Officers discovered the drugs which originated from Austria and Luxembourg during routine checks.