CVS and Express Scripts filed lawsuits on Thursday seeking to overturn an Arkansas state law set to go into effect next year that would ban pharmacy benefit managers from owning pharmacies. The law puts an unconstitutional restriction on interstate commerce by burdening out-of-state companies like Express Scripts,

CVS and Cigna-owned Express Scripts filed lawsuits Thursday to block an Arkansas law that tries to curb the power of pharmacy benefit managers (PBMs) in the state.

CVS and Express Scripts are asking a federal judge to block an Arkansas law prohibiting pharmacy benefit managers from owning or operating pharmacies in the state.