NEW YORK (TheStreet) -- Shares of Auxilium Pharmaceuticals (AUXL) were flat in morning trading Thursday despite the FDA's approval of the company's erectile dysfunction drug Stendra.

The drug cuts in half the time necessary between taking the pill and engaging in sexual activity. Stendra is the first FDA-approved oral erectile dysfunction drug that one can take approximately 15 minutes before sexual activity. Viagra, Pfizer's (PFE) - Get Pfizer Inc. Report famous blue pill, can be taken an hour prior to sex.

Auxilium developed the drug in conjunction with VIVUS  (VVUS) - Get VIVUS, Inc. Report .

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Auxilium is currently mulling a $2.2 billion takeover offer from Endo International (ENDP) - Get Endo International Plc Report  that would call off Auxilium's merger with Canadian biotech company QLT  (QLTI) .

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