WASHINGTON, D.C. - The U.S. Senate passed legislation on Monday that would make it illegal for insurance companies to keep pharmacists from telling customers how to save money by paying out of pocket for medicines instead of going through their insurance companies.

As a way to boost profits, some pharmacy benefit management companies impose "gag clauses" on pharmacists that keep them from telling customers if a prescription copay would cost more money than buying the drug without using insurance.

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