Senators Elizabeth Warren (D, Massachusetts) and Josh Hawley (R, Missouri) introduced the Break Up Big Medicine Act, legislation aimed at prohibiting the joint ownership of health insurers, pharmacy benefit managers (PBMs), providers, and wholesalers to reduce health care costs and restore competition... The legislation comes amid growing concerns about consolidation in the health care industry. In the US, 3 PBMs currently manage 80% of prescription drug claims, 2 and 3 wholesalers control 98% of prescription drug distribution... These entities are often vertically integrated, meaning a single parent company can own every component of the health care supply chain, from the...