Texas Attorney General Ken Paxton has sued Pfizer and its drug manufacturer for allegedly providing medicine it knew to be ineffective.

In a lawsuit unsealed Monday, Paxton sued Pfizer, Inc., Tris Pharma, Inc. and Tris CEO Ketan Mehta, accusing both companies of defrauding the state to get children’s ADHD medicine Quillivant XR added to the state’s list of preferred drugs under the Medicaid insurance program for low-income people. The drug previously failed to meet quality standards, he said.

According to Paxton, Pfizer and Tris “continually” manipulated quality-test results from 2012 to 2018 to obtain the benefit of taxpayer-funded Medicaid reimbursement for Quillivant.