Almost a million units of illegal medicines were detained here in 2017, according to the Health Products Regulatory Authority (HPRA).
The figure is more than a 40% increase on the previous year.
Almost half of the products detained were anabolic steroids, followed by sedatives and erectile dysfunction medicines.
The HPRA says it is concerned at the increase and is warning people of the health risks of taking unauthorised medicines.
HPRA highlight figures for 2017:
449,411 dosage units of anabolic steroids were detained in 2017, compared to 109,006 in 2016 and 38,049 in 2015;
222,470 sedative products were detained last year compared to 271,545 in 2016 and 726,164 in 2015;
The HPRA brought six prosecution cases in 2017 with a further six voluntary formal cautions issued during the year.
Source: The Irish Examiner, 17/04/18