GlaxoSmithKline PLC (GSK, GSK.LN) agreed to pay Impax Laboratories Inc. (IPXL) $11.5 million upfront, with potential milestone payments of up to an additional $175 million, for an exclusive license to sell the generic-drug maker's treatment for Parkinson's Disease outside the U.S. and Taiwan.

Under the agreement, Impax also would be eligible for tiered double-digit royalty payments.

The Parkinson's treatment currently is in late-phase clinical trials. The company expects to release study results next year and to file a new drug application with the U.S. Food and Drug Administration in late 2011.

Glaxo, with the exception of the U.S. and Taiwan, will be responsible for further development and commercialization of the drug.

Impax last month reported that its third-quarter profit soared on the addition of sales of its generic Adderall extended-release drug and other products and $196.4 million in previously deferred revenue owing to modifications of its strategic alliance with Teva Pharmaceutical Industries Ltd. (TEVA, TEVA.TV).

Glaxo's American depositary shares closed Wednesday at $39.80 while Impax shares were at $19.59.

-By Tess Stynes, Dow Jones Newswires; 212-416-2481; Tess.Stynes@dowjones.com;

 
 
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