Sanofi-Aventis and its lawyers at Ropes & Gray are accusing rival drugmaker Novo Nordisk Inc. of launching a false advertising campaign about the availability of Sanofi’s insulin drugs, Lantus and Toujeo.

According to a suit filed Dec. 23 in New Jersey federal court, Novo Nordisk sought to capitalize on a decision in August by prescription benefit manager CVS Caremark that removed Lantus and Toujeo from its standard formulary and replaced them with Basaglar, a product made by Eli Lilly & Co. A month later Novo Nordisk launched a nationwide marketing campaign that Sanofi complains falsely and misleadingly described the effects of CVS’s change, saying the Sanofi drugs would be “blocked” and urging doctors to convert patients to Tresiba.

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