The lawsuit also alleged that Pfizer, despite knowing of the quality-control issues, persuaded Texas' Medicaid program to add Quillivant to its list of preferred drugs.
The lawsuit accuses the companies of defrauding the state's Medicaid program, and seeks unspecified money damages from the companies.
Pfizer and Tris, which manufactured the drug for Pfizer, did not immediately respond to a request for comment.
The U.S. Food and Drug Administration in 2017 warned Tris of manufacturing lapses.
Reporting by Brendan Pierson in New York, Editing by Alexia Garamfalvi and Matthew LewisOur Standards: The Thomson Reuters Trust Principles.
Persons:
Dado Ruvic, Ken Paxton, Pfizer, Tris, Paxton, Quillivant, Tarik Ahmed, Brendan Pierson, Alexia Garamfalvi, Matthew Lewis
Organizations:
Pfizer, REUTERS, Texas, Tris, Republican, Nextwave Pharmaceuticals, U.S . Food, Drug Administration, Southern, of, Thomson
Locations:
Harrison County , Texas, Texas, U.S, Manhattan, of New York, New York