Auxilium Pharmaceuticals, a specialty biopharmaceutical company based in Malvern, Penn., and GlaxoSmithKline LLC, the U.S. subsidiary of GlaxoSmithKline plc, have entered into an agreement for the co-promotion of Auxilium’s Testim 1% (testosterone gel), which is indicated for testosterone replacement therapy in adult males for conditions associated with a deficiency or absence of testosterone.

GSK has received the exclusive right to co-promote the sale of Testim with Auxilium in the U.S. through September 30, 2015. GSK will promote Testim using a sizeable established field sales force which has relationships with current Testosterone Replacement Therapy (TRT) prescribers, particularly primary care physicians, in the U.S. These GSK sales representatives currently promote a range of cardiovascular, metabolic and urology products, and Testim will complement GSK's existing portfolio of products.

Auxilium and GSK have agreed on a baseline revenue forecast for Testim through September 30, 2015, and GSK will be compensated to the extent that Testim net sales exceed this baseline. In addition, in certain circumstances, Auxilium will pay GSK specified tail payments following the term of the agreement. The GSK sales force is expected to begin promoting Testim to physicians early in the third quarter 2012. Auxilium will remain responsible for all Testim commercial drug manufacturing, supply, and regulatory activities.

"While the Auxilium sales force has consistently performed well in an increasingly competitive environment, adding the strength and breadth of GSK's U.S. commercialization organization will further enhance our sales efforts with U.S. physicians who treat this condition,” said Adrian Adams, CEO and president of Auxilium.