Sanofi SA has won U.S. approval for its multiple sclerosis pill Aubagio – one of the two treatments for the chronic disease that could return the French drugmaker to growth after several blockbuster drugs lost patent protection.

The drug has been shown to be less effective than some rivals but has milder side effects and analysts say it could find favor among newly diagnosed patients. Around 35 percent to 40 percent of multiple sclerosis (MS) sufferers prefer to take no medication rather than face unwanted side effects.

“In a clinical trial, the relapse rate for patients using Aubagio was about 30 percent lower than the rate for those taking a placebo,” Russell Katz, director of the Division of Neurology Products at the Food and Drug Administration, said in a statement on Wednesday.

Aubagio is expected to launch on the U.S. market in a few weeks, a spokeswoman for Sanofi unit Genzyme said.

Multiple sclerosis, which has no cure, affects 2.5 million people worldwide. It is a chronic, often disabling disease that attacks the central nervous system and can lead to numbness, paralysis and loss of vision.

MS drugs Gilenya by Novartis and Biogen Idec Inc’s BG-12 are expected to dominate a market that JPMorgan analysts predict growing to $14 billion in 2015 from $9.6 billion last year.

Aubagio is seen grabbing a much smaller chunk of this market, reaching modest sales of $353 million in the United States and five major European countries by 2020, according to business intelligence firm Datamonitor.

Cheuvreux analyst Marcel Brand, who has a more optimistic forecast, predicts peak sales of Aubagio of 1.48 billion euros by 2018. “Although Aubagio is not as effective on relapse rates as Gilenya, it’s free of its longer-term side effects,” he said.

Patients taking Gilenya have to be monitored because the drug causes the heart rate to slow down in the first hours after ingestion.

European regulators are expected to give their response to Aubagio in the first quarter of 2013.

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Sanofi multiple sclerosis pill gets US approval

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