UPDATE 6-Orexigen diet pill wins US advisory panel backing

* Panel votes 13-7 that benefits outweigh risks

* Would be first new diet drug in a decade

* Contrave sales could reach $1.2 billion by 2018

* FDA expected to make final decision by Jan. 31

* Orexigen shares still halted, rival stocks rise (Adds panelist quote, rise in shares of Vivus, Arena)

By Susan Heavey

SILVER SPRING, Md., Dec 7 (Reuters) - U.S. health advisers recommended approval of the first new weight-loss pill in a decade on Tuesday, backing Orexigen Therapeutics Inc's OREX.O Contrave.

It was the last of a trio of new weight-loss drugs to come before regulators this year, the Food and Drug Administration having rejected two rival medicines in October.

The FDA panel of outside experts voted 13-7 that the weight-loss benefits seen with Contrave outweighed concerns about heart risks.

The FDA usually follows panel recommendations. A final ruling is due by Jan. 31.

Shares of Orexigen were still halted shortly after the vote but shares of rival Arena Pharmaceuticals Inc ARNA.O were 7 percent higher in after-hours trade and Vivus Inc VVUS.O rose 11 percent in extended trading.

The fate of Contrave is key to the California-based company, which focuses solely on obesity drugs and has no products on the market.

According to data from BioMedTracker, Contrave sales could reach $1.2 billion by 2018. That figure would make it the top player in a U.S. weight-loss drug market that sees just $382 million in sales annually, according to IMS Health.

Drugmakers seeking a pill to help people slim down have been thwarted for decades by serious side effects, and few options remain on the U.S. market even though two out of three Americans are overweight or obese. [ID:nN29219928]

In October, the FDA rejected Arena’s pill, citing cancers seen in animal studies, and Vivus was asked for more data on heart risks with its medicine.

Also in October, Abbott Laboratories ABT.N pulled its Meridia drug from the market under pressure from the FDA over heart risks.


Contrave combines the alcohol and drug addiction drug naltrexone with the antidepressant bupropion in an attempt to boost metabolism while curbing appetite and cravings.

Orexigen, which has partnered with Takeda Pharmaceutical Co Ltd 4502.T, said the 25-year history of both ingredients was an advantage because many safety issues are already known.

Study data showed a slight increase blood pressure and pulse rates for Contrave patients versus those given a placebo.

The pill met FDA effectiveness guidelines, in that at least 35 percent of patients studied lost at least 5 percent of their weight.

But many panelists said they had reservations about Contrave, including some who voted for approval.

“I feel the sponsor met the requirements of the FDA ... on the other hand, I feel this is a very flawed product,” said Michael Rogawski, a neurologist at the University of California Davis.

The FDA and Orexigen are already in talks about another trial to look more closely at whether those heart issues signal potential for greater cardiovascular side effects. (Reporting by Susan Heavey; Editing by Tim Dobbyn)