Sanofi raised the U.S. wholesale price of its Lantus vials by almost 15 percent to $16.64 per milliliter and of its Lantus Solostar injection pens by almost 10 percent to $18.38 per milliliter, Jack Cox, a spokesman for Paris-based Sanofi, said in an e-mail. Those increases followed a 10 percent price increase in April for both versions of Lantus, the world’s best-selling diabetes treatment.

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