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) --

Progenics Pharmaceuticals

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said it is getting back worldwide rights of the drug Relistor from



pharmaceutical unit.

Wyeth will pay Progenics $10 million in installments over six quarters to cover costs for the move, according to a press release issued on Wednesday. Progenics will take over full control following a one-year transition, during which Wyeth will continue commercial activities, ongoing clinical studies and regulatory activities for the drug. During the period, Wyeth will also pay royalties to Progenics.

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Progenics will also continue work developing the oral form of the drug.

Wyeth originally received licensing rights to Relistor -- a drug which treats constipation caused by pain-reducing opiod drugs -- in a 2005 agreement with Progenics. Fellow drug giant


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is in the process of buying out Wyeth in a $68 billion deal.

--Written by Sung Moss in New York

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