The mass walk out will take place on 18 January.
Workers voted to strike after the Secretary of State failed to provide the funding to address public sector pay a - as well as wider funding issues within health.
Alan Perry, GMB Senior Organiser, said:
“GMB members have simply had enough.
“They will not be used as political pawns in a process that would see the return of the Northern Ireland Executive.
“The Secretary of State made it clear that money is there; he must do the honourable thing and make it available now to address the concerns of members who desperately need it.”
