For the third quarter 2012, Rx Partner revenues declined $13.4 million, as the Company realized a $7.4 million profit share adjustment in the third quarter 2011 from Teva Pharmaceuticals Industries Limited (“Teva”) for which there was no comparable amount in the third quarter 2012. Also contributing to the decline in the third quarter 2012 Rx revenues were lower sales of our generic products through our Strategic Alliance Agreement with Teva and an estimated $2.0 million charge for the voluntary withdrawal of bupropion XL 300 mg from the market.
Research Partner revenues in the third quarter 2012 declined $2.4 million to $1.0 million, compared to the prior year period of $3.4 million, due to the extension of the revenue recognition period for the Joint Development Agreement with Medicis Pharmaceutical Corporation (the “Medicis Agreement”). During the third quarter 2012, the Company extended the estimated performance period from the previous recognition period ending November 2012 to November 2013 due to changes in the estimated timing of completion of certain research and development activities.
Gross profit in the third quarter 2012 was $56.3 million, compared to $60.4 million in the prior year period. The decline in gross profit was due to the third quarter 2011 receipt of $7.4 million in profit share adjustment from Teva for which there was no comparable amount in the third quarter 2012, as well as the change in the estimated performance period for the Medicis Agreement. Partially offsetting the third quarter 2012 decrease in gross profit was a reduction in the royalty rate paid on sales of our authorized generic Adderall XR ® products as a result of additional generic competition and increased sales of higher margin products. Gross margin in the third quarter 2012 increased to 56%, compared to 53% in the prior year period, due to the reduction in the royalty rate and increased sales of higher margin products as noted above.
Total generic operating expenses in the third quarter 2012 decreased $1.5 million to $15.8 million, compared to the prior year period of $17.3 million, due to lower patent litigation expenses resulting from the receipt of $5.0 million for reimbursement of legal fees received pursuant to the settlement of litigation. The increase in patent litigation expense before the $5.0 million reimbursement was the result of legal activity related to several Abbreviated New Drug Application cases.