The workers said after a two-week warning strike, the management still failed to address their grievances.
The workers also want the Federal Government to appoint a substantive director general for the agency.
This is coming two days after the workers ended a two-week warning strike.
They said the management has refused to do something about their demands despite the warning strike.
The Vice Chairman of the agency’s branch of Medical and Health Workers Union, Idzi Isua, said the workers have resolved to begin an indefinite strike soon if the authorities of the agency fail to address their grievances.
"It is either they answer us or we go on an indefinite strike until our demands are met," Isua told Premium Times at a brief protest by the workers at the headquarters of the Agency in Wuse, Abuja on Thursday, November 3.
According to him, the workers are also aggrieved over the process of promotion of staff in the agency.
"We gave a warning strike of two weeks and resumed yesterday (Wednesday), still nothing has been done about the issues. We are giving them a few days to respond.
"We are also calling on the government to appoint a substantive Director General for the Commission and revisit the recent recruitment of staff into the agency. Due process was not followed in the recruitment," he said.
However, it was gathered that NAFDAC management has decided to adopt the 'no work no pay' policy.