Dive Brief:

Express Scripts and the main pharmacy benefit manager lobby are suing to block a Tennessee law barring pharmacies affiliated with PBMs from operating in the state.

In separate lawsuits filed in Tennessee federal court, Express Scripts, a subsidiary of insurer Cigna, and the Pharmaceutical Care Management Association argue that the law is unconstitutional and will impede access to prescription drugs for hundreds of thousands of patients by forcing PBM-owned pharmacies to close.

Express Scripts, which filed its lawsuit Friday, is the second major PBM to sue over the law. CVS’ Caremark filed its own challenge in May.

Dive Insight: