Stephen J. Farr, Ph.D., president and chief operating officer of Zogenix, said, "In mid-July, the FDA accepted for review our NDA for Zohydro ER and provided a PDUFA date of March 1, 2013, in-line with our expectations for potential launch in the second quarter of 2013. For Relday, we enrolled the first patient in our open-label, safety and pharmacokinetic (PK) trial in July, keeping us on track with our goal to obtain the study data by year-end 2012. We believe that both Zohydro ER and Relday represent large new market opportunities for Zogenix and we continue to evaluate all potential commercialization options in order to maximize their value and potential for success. Finally, we recently announced the initiation of the DosePro technology co-marketing campaign with Battelle, which we believe will accelerate our partnership and out-licensing opportunities for DosePro within the biopharmaceutical industry."
Second Quarter 2012 Financial Results
Net product revenues for the second quarter were $8.0 million, reduced by a $630,000 net increase in the reserve for future product returns bringing the reserve balance to $2.9 million at June 30, 2012. This compares to net product revenues of $8.7 million in the second quarter 2011. In addition, total revenues for the second quarter 2011 included $1.6 million in contract revenue, reflecting the amortization of license and milestone payments received from the Company's co-promotion agreement with Astellas which ended March 31, 2012.
Cost of sales for the second quarter 2012 was $4.2 million, compared to $4.0 million in the second quarter 2011. Product gross margin was 48% in the second quarter 2012, compared to 54% in the second quarter 2011. The decrease in gross margin was driven primarily by a lower average net selling price, partially offset by lower per unit cost of sales.Royalty expense for the second quarter 2012 was $315,000, compared to $333,000 in the second quarter 2011, reflecting the impact of decreased net product revenue.