Workers at Bausch and Lomb in Waterford have voted in favour of Industrial Action.
There's a risk a full strike could take place after workers rejected a recommendation from the Labour Court on pay and conditions.
Siptu notified Bausch and Lomb on Monday that workers had voted in favour of strike action which is set to start on December 21st.
The workers who made huge sacrifices to keep the plant open in 2014 now want to see the wage cuts agreed then restored.
The company had offered an average wage increase of two thousand euro a year, two days extra holidays, fifty percent longer sick pay, and accelerated pay rates for new employees.
Currently a 115 million euro investment is underway at Bausch and Lomb Waterford with a total of 125 new posts expected to be in place by the end of next year.
Valeant Pharmaceuticals which purchased the Bausch & Lomb parent company in 2013 is struggling and has indicated that it now expects its revenues and profits to decline further next year.