By Jason Chow

PARIS--French drug maker Sanofi SA (SNY) said on Friday that it gained approval from Japanese authorities to market its new Toujeo diabetes drug.

Japan's Ministry of Health, Labor and Welfare granted authorization for the insulin drug under the trade name Lantus XR. The same drug is sold under the Toujeo name in the U.S. and Europe.

Sanofi has long hoped that Toujeo would eventually replace the revenue generated by its older Lantus diabetes drug. Lantus accounted for almost a fifth of the company's total sales in the most recent quarter but has been under pricing pressure in the crucial U.S. market. Lantus is also set to go off patent later this year.

Toujeo is currently available in the U.S., Germany, Denmark and the Netherlands. The company expects more countries to approve the drug "in the coming months."

Diabetes is one of the world's biggest drug markets, generating more than $38 billion in yearly sales, according to EvaluatePharma.

-Write Jason Chow at jason.chow@wsj.com

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