Factory gate prices fell by 0.4% between October and November, according to new figures from the Central Statistics Office.
This compares to an increase of 0.9% for November of last year.
The annual percentage change showed a decrease of 3.6% in November, compared to a fall of 2.3% in the year to October.
In the month, the price index for export sales was 0.3% lower, while the index for home sales down by 0.4%.
The most significant monthly changes were falls in Chemical and chemical products (-6.6%), Other food products including bread and confectionery (-0.6%) and Basic pharmaceutical products and pharmaceutical preparations (-0.1%).
Contributing to the annual change were decreases in Basic pharmaceutical products and pharmaceutical preparations (-9.5%), Chemical and chemical products (-8.8%) and Other manufacturing including medical and dental instruments and supplies (-4.0%), while there were increases in Basic metals (+18.8%), Dairy products (+16.5%) and Meat and meat products (+2.5%).
The yearly price index for Mining and quarrying increased by 1.3% while the monthly index decreased by 0.1%.
Building and Construction prices increased by 2.6% in the year since November 2016.
The most notable yearly changes were increases in Glass (+21.7%), Hardwood (+7.9%) and Fabricated metal (+7.7%) while there were decreases in Other concrete products excluding precast concrete (-0.8%), Ready mixed mortar and concrete (-0.7%) and Insulating materials (-0.6%).
Year on year, the price of Capital goods increased by 1.4%, while the monthly price decreased by 0.2%.
The price of Energy products increased by 6.4% in the year since November 2016, while Petroleum fuels increased by 8.7%.
In November 2017, the monthly price index for Energy products rose by 12.8%, while Petroleum fuels increased by 3.1%.
