ENDP » Topics » Paragraph IV Certifications on Opana ER

This excerpt taken from the ENDP 10-Q filed May 11, 2009.

Paragraph IV Certifications on Opana® ER

On December 14, 2007, the Company received a notice from IMPAX Laboratories , Inc. (IMPAX) advising of the FDA’s apparent acceptance for substantive review, as of November 23, 2007, of IMPAX’s amended ANDA for a generic version of Opana® ER (oxymorphone hydrochloride extended-release tablets CII). IMPAX stated in its letter that the FDA requested IMPAX to provide notification to us and Penwest of any Paragraph IV certifications submitted with its ANDA, as required under section 355(j) of the Federal Food, Drug and Cosmetics Act, or the FDCA Act. Accordingly, IMPAX’s letter included notification that it had filed Paragraph IV certifications with respect to Penwest’s U.S. Patent Nos. 7,276,250, 5,958,456 and 5,662,933, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire in 2022, 2013 and 2013, respectively. The Company’s Opana® ER product has new dosage form exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. In addition, because IMPAX’s application referred to patents owned by Penwest and contained a Paragraph IV certification under section 355(j) of the FDCA Act, we believe IMPAX’s notice triggered the 45-day period under the FDCA Act in which we and Penwest could file a patent infringement action and trigger the automatic 30-month stay of approval. Subsequently, on January 25, 2008, the Company and our partner Penwest filed a lawsuit against IMPAX in the United States District Court for the District of Delaware in connection with IMPAX’s ANDA. The lawsuit alleges infringement of certain Orange Book-listed U.S. patents that cover the Opana® ER formulation. In response, Impax filed an answer and counterclaims, asserting claims for declaratory judgment that the patents listed in the Orange Book are invalid, not infringed and/or unenforceable. Additionally, the lawsuit previously filed by the Company and Penwest on November 15, 2007 against IMPAX remains pending. We cannot predict the outcome of this litigation.

On June 16, 2008, the Company received a notice from IMPAX that it had filed an amendment to its ANDA containing Paragraph IV certifications for the 7.5 mg, 15 mg and 30 mg strengths of oxymorphone hydrochloride extended release tablets. The notice covers Penwest’s U.S. Patent Nos. 7,276,250, 5,958,456 and 5,662,933. Subsequently, on July 25, 2008, the Company and our partner Penwest filed a lawsuit against IMPAX in the United States District Court for the District of Delaware in connection with IMPAX’s amended ANDA. The lawsuit alleges infringement of certain Orange Book-listed U.S. patents that cover the Opana® ER formulation. In response, Impax filed an answer and counterclaims, asserting claims for declaratory judgment that the patents listed in the Orange Book are invalid, not infringed and/or unenforceable. Additionally, the lawsuits previously filed by the Company and Penwest against IMPAX remain pending.

All three of these pending suits against IMPAX were transferred to the United States District Court for the District of New Jersey. We cannot predict the outcome of this litigation. We intend, and we have been advised by Penwest that they too intend, to pursue all available legal and regulatory avenues in defense of Opana® ER, including enforcement of our intellectual property rights and approved labeling.

 

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In February 2008, we along with our partner Penwest, received a notice from Actavis South Atlantic LLC, (Actavis), advising of the filing by Actavis of an ANDA containing a Paragraph IV certification under 21 U.S.C. Section 355(j) for a generic version of Opana® ER (oxymorphone hydrochloride extended-release tablets CII). The Actavis Paragraph IV certification notice refers to Penwest’s U.S. Patent Nos. 5,128,143, 5,662,933, 5,958,456 and 7,276,250, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire or expired in 2008, 2013, 2013 and 2023, respectively. In addition to these patents, Opana® ER has a new dosage form (NDA) exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. Subsequently, on March 28, 2008, we and Penwest filed a lawsuit against Actavis in the U.S. District Court for the District of New Jersey in connection with Actavis’s ANDA. The lawsuit alleges infringement of an Orange Book-listed U.S. patent that covers the Opana® ER formulation. On May 5, 2008, Actavis filed an answer and counterclaims, asserting claims for declaratory judgment that the patents listed in the Orange Book are invalid, not infringed and/or unenforceable, as well as a claim of unfair competition against Endo and Penwest.

On or around June 2, 2008, the Company received a notice from Actavis that it had filed an amendment to its ANDA containing Paragraph IV certifications for the 7.5 mg and 15 mg dosage strengths of oxymorphone hydrochloride extended release tablets. On or around July 2, 2008, the Company received a notice from Actavis that it had filed an amendment to its ANDA containing Paragraph IV certifications for the 30 mg dosage strength. Both notices cover Penwest’s U.S. Patent Nos. 5,128,143, 7,276,250, 5,958,456 and 5,662,933. On July 11, 2008, the Company and Penwest, filed suit against Actavis in the United States District Court for the District of New Jersey. The lawsuit alleges infringement of an Orange Book-listed U.S. patent that covers the Opana® ER formulation. On August 14, 2008, Actavis filed an answer and counterclaims, asserting claims for declaratory judgment that the patents listed in the Orange Book are invalid, not infringed and/or unenforceable, as well as a claim of unfair competition against Endo and Penwest.

On February 20, 2009, Endo and Penwest settled all of the Actavis litigation. Both sides dismissed their respective claims and counterclaim with prejudice. Under the terms of the settlement, Actavis agreed not to challenge the validity or enforceability of Penwest’s patents relating to Opana® ER. Endo and Penwest agreed to grant Actavis a license permitting the production and sale of generic Opana® ER 7.5 and 15 mg tablets by the earlier of July 15, 2011, the last day Actavis would forfeit its 180-day exclusivity, and the date on which any third party commences commercial sales of a generic oxymorphone hydrochloride extended-release tablets, but not before November 28, 2010. Endo and Penwest also granted Actavis a license to produce and market other strengths of Opana® ER generic on the earlier of July 15, 2011 and the date on which any third party commences commercial sales of a generic form of the drug.

On July 14, 2008, the Company received a notice from Sandoz, Inc. (Sandoz), advising of the filing by Sandoz of an ANDA containing a Paragraph IV certification under 21 U.S.C. Section 355(j) with respect to oxymorphone hydrochloride extended-release oral tablets in 5 mg, 10 mg, 20 mg and 40 mg dosage strengths. The Sandoz Paragraph IV certification notice refers to Penwest’s U.S. Patent Nos. 5,662,933, 5,958,456 and 7,276,250, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire in 2013, 2013 and 2023, respectively. In addition to these patents, Opana® ER has a new dosage form (NDA) exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. Subsequently, on August 22, 2008, the Company and our partner Penwest filed a lawsuit against Sandoz in the United States District Court for the District of Delaware in connection with Sandoz’s ANDA. The lawsuit alleges infringement of an Orange Book-listed U.S. patent that covers the Opana® ER formulation. In response, Sandoz filed an answer and counterclaims, asserting claims for declaratory judgment that the patents listed in the Orange Book are invalid, not infringed and/or unenforceable.

On or around November 17, 2008, the Company received a notice from Sandoz that it had filed an amendment to its ANDA containing Paragraph IV certifications for the 7.5 mg, 15 mg and 30 mg dosage strengths of oxymorphone hydrochloride extended release tablets. The notice covers Penwest’s U.S. Patent Nos. 5,128,143, 7,276,250, 5,958,456 and 5,662,933. On December 30, 2008, the Company and Penwest, filed suit against Sandoz in the United States District Court for the District of New Jersey. The lawsuit alleges infringement of an Orange Book-listed U.S. patent that covers the Opana® ER formulation. In response, Sandoz filed an answer and counterclaims, asserting claims for declaratory judgment that the patents listed in the Orange Book are invalid, not infringed and/or unenforceable.

Both of these pending suits against Sandoz were transferred to the United States District Court for the District of New Jersey. We cannot predict the outcome of this litigation. We intend, and we have been advised by Penwest that they too intend, to pursue all available legal and regulatory avenues in defense of Opana®ER, including enforcement of our intellectual property rights and approved labeling.

On September 12, 2008, the Company received a notice from Barr Laboratories, Inc. (Barr), advising of the filing by Barr of an ANDA containing a Paragraph IV certification under 21 U.S.C. Section 355(j) with respect to oxymorphone hydrochloride extended-release oral tablets in a 40 mg dosage strength. On September 15, 2008, the Company received a notice from Barr that it had filed an ANDA containing a Paragraph IV certification under 21 U.S.C. Section 355(j) with respect to oxymorphone hydrochloride extended-release oral tablets in 5 mg, 10 mg, and 20 mg dosage strengths. Both notices refer to Penwest’s U.S. Patent Nos. 5,662,933, 5,958,456 and 7,276,250, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire in 2013, 2013 and 2023, respectively. In addition to these patents, Opana® ER has a new dosage form (NDA) exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. Subsequently, on October 20, 2008, the Company and our partner

 

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Penwest filed a lawsuit against Barr in the United States District Court for the District of Delaware in connection with Barr’s ANDA. The lawsuit alleges infringement of certain Orange Book-listed U.S. patents that cover the Opana® ER formulation. In response, Barr filed an answer and counterclaims, asserting claims for declaratory judgment that the patents listed in the Orange Book are invalid, not infringed and/or unenforceable. This suit was transferred to the United States District Court for the District of New Jersey. We cannot predict the outcome of this litigation. We intend, and we have been advised by Penwest that they too intend, to pursue all available legal and regulatory avenues in defense of Opana® ER, including enforcement of our intellectual property rights and approved labeling.

This excerpt taken from the ENDP 10-K filed Mar 2, 2009.

Paragraph IV Certifications on Opana® ER

On December 14, 2007, the Company received a notice from IMPAX advising of the FDA’s apparent acceptance for substantive review, as of November 23, 2007, of IMPAX’s amended ANDA for a generic version of Opana® ER (oxymorphone hydrochloride extended-release tablets CII). IMPAX stated in its letter that the FDA requested IMPAX to provide notification to us and Penwest of any Paragraph IV certifications submitted with its ANDA, as required under section 355(j) of the Federal Food, Drug and Cosmetics Act, or the FDCA Act. Accordingly, IMPAX’s letter included notification that it had filed Paragraph IV certifications with respect to Penwest’s U.S. Patent Nos. 7,276,250, 5,958,456 and 5,662,933, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire in 2022, 2013 and 2013, respectively. The Company’s Opana® ER product has new dosage form exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. In addition, because IMPAX’s application referred to patents owned by Penwest and contained a Paragraph IV certification under section 355(j) of the FDCA Act, we believe IMPAX’s notice triggered the 45-day period under the FDCA Act in which we and Penwest could file a patent infringement action and trigger the automatic 30-month stay of approval. Subsequently, on January 25, 2008, the Company and our partner Penwest filed a lawsuit against IMPAX in the United States District Court for the District of Delaware in connection with IMPAX’s ANDA. The lawsuit alleges infringement of certain Orange Book-listed U.S. patents that cover the Opana® ER formulation. In response, Impax filed an answer and counterclaims, asserting claims for declaratory judgment that the patents listed in the Orange Book are invalid, not infringed and/or unenforceable. Additionally, the lawsuit previously filed by the Company and Penwest on November 15, 2007 against IMPAX remains pending. We cannot predict the outcome of this litigation.

 

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On June 16, 2008, the Company received a notice from IMPAX that it had filed an amendment to its ANDA containing Paragraph IV certifications for the 7.5 mg, 15 mg and 30 mg strengths of oxymorphone hydrochloride extended release tablets. The notice covers Penwest’s U.S. Patent Nos. 7,276,250, 5,958,456 and 5,662,933. Subsequently, on July 25, 2008, the Company and our partner Penwest filed a lawsuit against IMPAX in the United States District Court for the District of Delaware in connection with IMPAX’s amended ANDA. The lawsuit alleges infringement of certain Orange Book-listed U.S. patents that cover the Opana® ER formulation. In response, Impax filed an answer and counterclaims, asserting claims for declaratory judgment that the patents listed in the Orange Book are invalid, not infringed and/or unenforceable. Additionally, the lawsuits previously filed by the Company and Penwest against IMPAX remain pending. We cannot predict the outcome of this litigation.

In February 2008, we along with our partner Penwest, received a notice from Actavis South Atlantic LLC, (Actavis), advising of the filing by Actavis of an ANDA containing a Paragraph IV certification under 21 U.S.C. Section 355(j) for a generic version of Opana® ER (oxymorphone hydrochloride extended-release tablets CII). The Actavis Paragraph IV certification notice refers to Penwest’s U.S. Patent Nos. 5,128,143, 5,662,933, 5,958,456 and 7,276,250, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire or expired in 2008, 2013, 2013 and 2023, respectively. In addition to these patents, Opana® ER has a new dosage form (NDA) exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. Subsequently, on March 28, 2008, we and Penwest filed a lawsuit against Actavis in the U.S. District Court for the District of New Jersey in connection with Actavis’s ANDA. The lawsuit alleges infringement of an Orange Book-listed U.S. patent that covers the Opana® ER formulation. On May 5, 2008, Actavis filed an answer and counterclaims, asserting claims for declaratory judgment that the patents listed in the Orange Book are invalid, not infringed and/or unenforceable, as well as a claim of unfair competition against Endo and Penwest.

On or around June 2, 2008, the Company received a notice from Actavis that it had filed an amendment to its ANDA containing Paragraph IV certifications for the 7.5 mg and 15 mg dosage strengths of oxymorphone hydrochloride extended release tablets. On or around July 2, 2008, the Company received a notice from Actavis that it had filed an amendment to its ANDA containing Paragraph IV certifications for the 30 mg dosage strength. Both notices cover Penwest’s U.S. Patent Nos. 5,128,143, 7,276,250, 5,958,456 and 5,662,933. On July 11, 2008, the Company and Penwest, filed suit against Actavis in the United States District Court for the District of New Jersey. The lawsuit alleges infringement of an Orange Book-listed U.S. patent that covers the Opana® ER formulation. On August 14, 2008, Actavis filed an answer and counterclaims, asserting claims for declaratory judgment that the patents listed in the Orange Book are invalid, not infringed and/or unenforceable, as well as a claim of unfair competition against Endo and Penwest.

On February 20, 2009, Endo and Penwest settled all of the Actavis litigation. Both sides dismissed their respective claims and counterclaim with prejudice. Under the terms of the settlement, Actavis agreed not to challenge the validity or enforceability of Penwest’s patents relating to Opana® ER. Endo and Penwest agreed to grant Actavis a license permitting the production and sale of generic Opana® ER 7.5 and 15 mg tablets by the earlier of July 15, 2011, the last day Actavis would forfeit its 180-day exclusivity, and the date on which any third party commences commercial sales of a generic oxymorphone hydrochloride extended-release tablets, but not before November 28, 2010. Endo and Penwest also granted Actavis a license to produce and market other strengths of Opana® ER generic on the earlier of July 15, 2011 and the date on which any third party commences commercial sales of a generic form of the drug.

On July 14, 2008, the Company received a notice from Sandoz, Inc. (Sandoz), advising of the filing by Sandoz of an ANDA containing a Paragraph IV certification under 21 U.S.C. Section 355(j) with respect to oxymorphone hydrochloride extended-release oral tablets in 5 mg, 10 mg, 20 mg and 40 mg dosage strengths. The Sandoz Paragraph IV certification notice refers to Penwest’s U.S. Patent Nos. 5,662,933, 5,958,456 and 7,276,250, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and

 

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expire in 2013, 2013 and 2023, respectively. In addition to these patents, Opana® ER has a new dosage form (NDA) exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. Subsequently, on August 22, 2008, the Company and our partner Penwest filed a lawsuit against Sandoz in the United States District Court for the District of Delaware in connection with Sandoz’s ANDA. The lawsuit alleges infringement of an Orange Book-listed U.S. patents that cover the Opana® ER formulation. In response, Sandoz filed an answer and counterclaims, asserting claims for declaratory judgment that the patents listed in the Orange Book are invalid, not infringed and/or unenforceable. We cannot predict the outcome of this litigation. We intend, and we have been advised by Penwest that they too intend, to pursue all available legal and regulatory avenues in defense of Opana® ER, including enforcement of our intellectual property rights and approved labeling.

On or around November 17, 2008, the Company received a notice from Sandoz that it had filed an amendment to its ANDA containing Paragraph IV certifications for the 7.5 mg, 15 mg and 30 mg dosage strengths of oxymorphone hydrochloride extended release tablets. The notice covers Penwest’s U.S. Patent Nos. 5,128,143, 7,276,250, 5,958,456 and 5,662,933. On December 30, 2008, the Company and Penwest, filed suit against Sandoz in the United States District Court for the District of New Jersey. The lawsuit alleges infringement of an Orange Book-listed U.S. patent that covers the Opana® ER formulation. In response, Sandoz filed an answer and counterclaims, asserting claims for declaratory judgment that the patents listed in the Orange Book are invalid, not infringed and/or unenforceable. We cannot predict the outcome of this litigation. We intend, and we have been advised by Penwest that they too intend, to pursue all available legal and regulatory avenues in defense of Opana®ER, including enforcement of our intellectual property rights and approved labeling.

On September 12, 2008, the Company received a notice from Barr Laboratories, Inc. or Barr, advising of the filing by Barr of an ANDA containing a Paragraph IV certification under 21 U.S.C. Section 355(j) with respect to oxymorphone hydrochloride extended-release oral tablets in a 40 mg dosage strength. On September 15, 2008, the Company received a notice from Barr that it had filed an ANDA containing a Paragraph IV certification under 21 U.S.C. Section 355(j) with respect to oxymorphone hydrochloride extended-release oral tablets in 5 mg, 10 mg, and 20 mg dosage strengths. Both notices refer to Penwest’s U.S. Patent Nos. 5,662,933, 5,958,456 and 7,276,250, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire in 2013, 2013 and 2023, respectively. In addition to these patents, Opana® ER has a new dosage form (NDA) exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. Subsequently, on October 20, 2008, the Company and our partner Penwest filed a lawsuit against Barr in the United States District Court for the District of Delaware in connection with Barr’s ANDA. The lawsuit alleges infringement of certain Orange Book-listed U.S. patents that cover the Opana® ER formulation. In response, Barr filed an answer and counterclaims, asserting claims for declaratory judgment that the patents listed in the Orange Book are invalid, not infringed and/or unenforceable. We cannot predict the outcome of this litigation. We intend, and we have been advised by Penwest that they too intend, to pursue all available legal and regulatory avenues in defense of Opana® ER, including enforcement of our intellectual property rights and approved labeling.

This excerpt taken from the ENDP 10-Q filed Oct 30, 2008.

Paragraph IV Certifications on Opana® ER

On December 14, 2007, the Company received a notice from IMPAX advising of the FDA’s apparent acceptance for substantive review, as of November 23, 2007, of IMPAX’s amended ANDA for a generic version of Opana® ER. IMPAX stated in its letter that the FDA requested IMPAX to provide notification to us and Penwest of any Paragraph IV certifications submitted with its ANDA, as required under section 355(j) of the Federal Food, Drug and Cosmetics Act, or the FDCA Act. Accordingly, IMPAX’s letter included notification that it had filed Paragraph IV certifications with respect to Penwest’s U.S. Patent Nos. 7,276,250, 5,958,456 and 5,662,933, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire in 2022, 2013 and 2013, respectively. The Company’s Opana® ER product has new dosage form exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. In addition, because IMPAX’s application referred to patents owned by Penwest and contained a Paragraph IV certification under section 355(j) of the FDCA Act, we believe IMPAX’s notice triggered the 45-day period under the FDCA Act in which we and Penwest could file a patent infringement action and trigger the automatic 30-month stay of approval. Subsequently, on January 25, 2008, the Company and our partner Penwest filed a lawsuit against IMPAX in the United States District Court for the District of Delaware in connection with IMPAX’s ANDA. The lawsuit alleges infringement of certain Orange Book-listed U.S. patents that cover the Opana® ER formulation. Additionally, the lawsuit previously filed by the Company and Penwest on November 15, 2007 against IMPAX remains pending. We cannot predict the outcome of this litigation.

On June 16, 2008, the Company received a notice from IMPAX that it had filed an amended ANDA containing Paragraph IV certifications for the 7.5 mg, 15 mg and 30 mg strengths of oxymorphone hydrochloride extended release tablets. The notice covers Penwest’s U.S. Patent Nos. 7,276,250, 5,958,456 and 5,662,933. Subsequently, on July 25, 2008, the Company and our partner Penwest filed a lawsuit against IMPAX in the United States District Court for the District of Delaware in connection with IMPAX’s ANDA. The lawsuit alleges infringement of certain Orange Book-listed U.S. patents that cover the Opana® ER formulation. Additionally, the lawsuits previously filed by the Company and Penwest on s against IMPAX remain pending. We cannot predict the outcome of this litigation.

In February 2008, we along with our partner Penwest, received a notice from Actavis South Atlantic LLC, or Actavis, advising of the filing by Actavis of an ANDA containing a Paragraph IV certification under 21 U.S.C. Section 355(j) for a generic version of Opana® ER (oxymorphone hydrochloride extended-release tablets CII). The Actavis Paragraph IV certification notice refers to Penwest’s U.S. Patent Nos. 5,128,143, 5,662,933, 5,958,456 and 7,276,250, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire in 2008, 2013, 2013 and 2023, respectively. In addition to these patents, Opana® ER has a new dosage form (NDA) exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. Subsequently, on March 28, 2008, we and Penwest filed a lawsuit against Actavis in the U.S. District Court for the District of New Jersey in connection with Actavis’s ANDA. The lawsuit alleges infringement of an Orange Book-listed U.S. patents that covers the Opana® ER formulation. On May 5, 2008, Actavis filed an answer and counterclaims, asserting claims for declaratory judgment that the patents listed in the Orange Book are invalid, not infringed and/or unenforceable, as well as a claim of unfair competition against Endo and Penwest. Endo has filed a motion to dismiss or stay the unfair competition claim, which is pending. We cannot predict the outcome of this litigation. We intend, and we have been advised by Penwest that they too intend, to pursue all available legal and regulatory avenues in defense of Opana® ER, including enforcement of our intellectual property rights and approved labeling.

 

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On or around June 2, 2008, the Company received a notice from Actavis that it had filed an amended ANDA containing Paragraph IV certifications for the 7.5 mg and 15 mg dosage strengths of oxymorphone hydrochloride extended release tablets. On or around July 2, 2008, the Company received a notice from Actavis that it had filed an amended ANDA containing Paragraph IV certifications for the 30 mg dosage strength. Both notices cover Penwest’s U.S. Patent Nos. 5,128,143, 7,276,250, 5,958,456 and 5,662,933. On July 11, 2008, the Company and Penwest, filed suit against Actavis in the United States District Court for the District of New Jersey. The lawsuit alleges infringement of an Orange Book-listed U.S. patent that covers the Opana® ER formulation. We cannot predict the outcome of this litigation. We intend, and we have been advised by Penwest that they too intend, to pursue all available legal and regulatory avenues in defense of Opana®ER, including enforcement of our intellectual property rights and approved labeling.

On July 14, 2008, the Company received a notice from Sandoz, Inc. or Sandoz, advising of the filing by Sandoz of an ANDA containing a Paragraph IV certification under 21 U.S.C. Section 355(j) with respect to oxymorphone hydrochloride extended-release oral tablets in 5 mg, 10 mg, 20 mg and 40 mg dosage strengths. The Sandoz Paragraph IV certification notice refers to Penwest’s U.S. Patent Nos. 5,662,933, 5,958,456 and 7,276,250, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire in 2013, 2013 and 2023, respectively. In addition to these patents, Opana® ER has a new dosage form (NDA) exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. Subsequently, on August 22, 2008, the Company and our partner Penwest filed a lawsuit against Sandoz in the United States District Court for the District of Delaware in connection with Sandoz’s ANDA. The lawsuit alleges infringement of certain Orange Book-listed U.S. patents that cover the Opana® ER formulation. We cannot predict the outcome of this litigation. We intend, and we have been advised by Penwest that they too intend, to pursue all available legal and regulatory avenues in defense of Opana® ER, including enforcement of our intellectual property rights and approved labeling.

On September 12, 2008, the Company received a notice from Barr Laboratories, Inc. or Barr, advising of the filing by Barr of an ANDA containing a Paragraph IV certification under 21 U.S.C. Section 355(j) with respect to oxymorphone hydrochloride extended-release oral tablets in a 40 mg dosage strength. On September 15, 2008, the Company received a notice from Barr that it had filed an ANDA containing a Paragraph IV certification under 21 U.S.C. Section 355(j) with respect to oxymorphone hydrochloride extended-release oral tablets in 5 mg, 10 mg, and 20 mg dosage strengths.

Both notices refer to Penwest’s U.S. Patent Nos. 5,662,933, 5,958,456 and 7,276,250, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire in 2013, 2013 and 2023, respectively. In addition to these patents, Opana® ER has a new dosage form (NDA) exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. Subsequently, on October 20, 2008, the Company and our partner Penwest filed a lawsuit against Barr in the United States District Court for the District of Delaware in connection with Barr’s ANDA. The lawsuit alleges infringement of certain Orange Book-listed U.S. patents that cover the Opana® ER formulation. We cannot predict the outcome of this litigation. We intend, and we have been advised by Penwest that they too intend, to pursue all available legal and regulatory avenues in defense of Opana® ER, including enforcement of our intellectual property rights and approved labeling.

This excerpt taken from the ENDP 10-Q filed Aug 1, 2008.

Paragraph IV Certifications on Opana® ER

On December 14, 2007, the Company received a notice from IMPAX advising of the FDA’s apparent acceptance for substantive review, as of November 23, 2007, of IMPAX’s amended ANDA for a generic version of Opana® ER. IMPAX stated in its letter that the FDA requested IMPAX to provide notification to us and Penwest of any Paragraph IV certifications submitted with its ANDA, as required under section 355(j) of the Federal Food, Drug and Cosmetics Act, or the FDCA Act. Accordingly, IMPAX’s letter included notification that it had filed Paragraph IV certifications with respect to Penwest’s U.S. Patent Nos. 7,276,250, 5,958,456 and 5,662,933, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire in 2022, 2013 and 2013, respectively. The Company’s Opana® ER product has new dosage form exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. In addition, because IMPAX’s application referred to patents owned by Penwest and contained a Paragraph IV certification under section 355(j) of the FDCA Act, we believe IMPAX’s notice triggered the 45-day period under the FDCA Act in which we and Penwest could file a patent infringement action and trigger the automatic 30-month stay of approval. Subsequently, on January 25, 2008, the Company and our partner Penwest filed a lawsuit against IMPAX in the United States District Court for the District of Delaware in connection with IMPAX’s ANDA. The lawsuit alleges infringement of certain Orange Book-listed U.S. patents that cover the Opana® ER formulation. Additionally, the lawsuit previously filed by the Company and Penwest on November 15, 2007 against IMPAX remains pending. We cannot predict the outcome of this litigation.

On June 16, 2008, the Company received a notice from IMPAX that it had filed an amended ANDA containing Paragraph IV certifications for the 7.5 mg, 15 mg and 30 mg strengths of oxymorphone hydrochloride extended release tablets. The notice covers Penwest’s U.S. Patent Nos. 7,276,250, 5,958,456 and 5,662,933. The Company is considering the notices, which in the relevant respects are the same as the notices previously provided with respect to the 5 mg, 10 mg, 20 mg and 40 mg dosage strengths. We intend, and we have been advised by Penwest that they too intend, to pursue all available legal and regulatory avenues in defense of Opana® ER, including enforcement of our intellectual property rights and approved labeling.

In February 2008, we along with our partner Penwest, received a notice from Actavis South Atlantic LLC, or Actavis, advising of the filing by Actavis of an ANDA containing a Paragraph IV certification under 21 U.S.C. Section 355(j) for a generic version of Opana® ER (oxymorphone hydrochloride extended-release tablets CII). The Actavis Paragraph IV certification notice refers to Penwest’s U.S. Patent Nos. 5,128,143, 5,662,933, 5,958,456 and 7,276,250, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire in 2008, 2013, 2013 and 2023, respectively. In addition to these patents, Opana® ER has a new dosage form (NDA) exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. Subsequently, on March 28, 2008, we and Penwest filed a lawsuit against Actavis in the U.S. District Court for the District of New Jersey in connection with Actavis’s ANDA. The lawsuit alleges infringement of an Orange Book-listed U.S. patents that covers the Opana® ER formulation. On May 5, 2008, Actavis filed an answer and counterclaims, asserting claims for declaratory judgment that the patents listed in the Orange Book are invalid, not infringed and/or unenforceable, as well as a claim of unfair competition against Endo and Penwest. Endo has filed a motion to dismiss or stay the unfair competition claim, which is pending. We cannot predict the outcome of this litigation. We intend, and we have been advised by Penwest that they too intend, to pursue all available legal and regulatory avenues in defense of Opana® ER, including enforcement of our intellectual property rights and approved labeling.

On or around June 2, 2008, the Company received a notice from Actavis that it had filed an amended ANDA containing Paragraph IV certifications for the 7.5 mg and 15 mg dosage strengths of oxymorphone hydrochloride extended release tablets. On or around July 2, 2008, the Company received a notice from Actavis that it had filed an amended ANDA containing Paragraph IV certifications for the 30 mg dosage strength. Both notices cover Penwest’s U.S. Patent Nos. 5,128,143, 7,276,250, 5,958,456 and

 

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5,662,933. On July 11, 2008, the Company and Penwest, filed suit against Actavis in the United States District Court for the District of New Jersey. The lawsuit alleges infringement of an Orange Book-listed U.S. patent that covers the Opana® ER formulation. We cannot predict the outcome of this litigation. We intend, and we have been advised by Penwest that they too intend, to pursue all available legal and regulatory avenues in defense of Opana®ER, including enforcement of our intellectual property rights and approved labeling.

On July 14, 2008, the Company received a notice from Sandoz, Inc. (“Sandoz”), advising of the filing by Sandoz of an ANDA containing a Paragraph IV certification under 21 U.S.C. Section 355(j) with respect to oxymorphone hydrochloride extended-release oral tablets in 5 mg, 10 mg, 20 mg and 40 mg dosage strengths. The Sandoz Paragraph IV certification notice refers to Penwest’s U.S. Patent Nos. 5,662,933, 5,958,456 and 7,276,250, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire in 2013, 2013 and 2023, respectively. In addition to these patents, Opana® ER has a new dosage form (NDA) exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. We are currently evaluating these developments. We intend, and we have been advised by Penwest that they too intend, to pursue all available legal and regulatory avenues in defense of Opana® ER, including enforcement of our intellectual property rights and approved labeling.

This excerpt taken from the ENDP 10-Q filed May 2, 2008.

Paragraph IV Certifications on Opana® ER

On December 14, 2007, the Company received a notice from IMPAX advising of the FDA’s apparent acceptance for substantive review, as of November 23, 2007, of IMPAX’s amended ANDA for a generic version of Opana® ER. IMPAX stated in its letter that the FDA requested IMPAX to provide notification to us and Penwest of any Paragraph IV certifications submitted with its ANDA, as required under section 355(j) of the FDCA Act. Accordingly, IMPAX’s letter included notification that it had filed Paragraph IV certifications with respect to Penwest’s U.S. Patent Nos. 7,276,250, 5,958,456 and 5,662,933, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire in 2022, 2013 and 2013, respectively. The Company’s Opana® ER product has new dosage form exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. In addition, because IMPAX’s application referred to patents owned by Penwest and contained a Paragraph IV certification under section 355(j) of the FDCA Act, we believe IMPAX’s notice triggered the 45-day period under the FDCA Act in which we and Penwest could file a patent infringement action and trigger the automatic 30-month stay of approval. Subsequently, on January 25, 2008, the Company and our partner Penwest filed a lawsuit against IMPAX in the United States District Court for the District of Delaware in connection with IMPAX’s ANDA. The lawsuit alleges infringement of certain Orange Book-listed U.S. patents that cover the Opana® ER formulation. Additionally, the lawsuit previously filed by the Company and Penwest on November 15, 2007 against IMPAX remains pending. We cannot predict the outcome of this litigation.

In February 2008, we along with our partner Penwest, received a notice from Actavis South Atlantic LLC, or Actavis, advising of the filing by Actavis of an ANDA containing a Paragraph IV certification under 21 U.S.C. Section 355(j) for a generic version of Opana® ER (oxymorphone hydrochloride extended-release tablets CII). The Actavis Paragraph IV certification notice refers to Penwest’s U.S. Patent Nos. 5,128,143, 5,662,933, 5,958,456 and 7,276,250, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire in 2008, 2013, 2013 and 2023, respectively. In addition to these patents, Opana® ER has a new dosage form (NDA) exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. Subsequently, on March 28, 2008, we and Penwest filed a lawsuit against Actavis in the U.S. District Court for the District of New Jersey in connection with Actavis’s ANDA. The lawsuit alleges infringement of certain Orange Book-listed U.S. patents that cover the Opana® ER formulation. We cannot predict the outcome of this litigation. We note that we and Penwest intend to pursue all available legal and regulatory avenues in defense of Opana® ER, including enforcement of our intellectual property rights and approved labeling.

This excerpt taken from the ENDP 10-K filed Feb 26, 2008.

Paragraph IV Certifications on Opana® ER

On December 14, 2007, the Company received a notice from IMPAX advising of the FDA’s apparent acceptance for substantive review, as of November 23, 2007, of IMPAX’s amended ANDA for generic versions of Opana® ER. IMPAX stated in its letter that the FDA requested IMPAX to provide notification to the Company and Penwest of any Paragraph IV certifications submitted with its ANDA, as required under section 355(j) of the Act. Accordingly, IMPAX’s letter included notification that it had filed Paragraph IV certifications with respect to Penwest’s U.S. Patent Nos. 7,276,250, 5,958,456 and 5,662,933, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire in 2022, 2013 and 2013, respectively. The Company’s Opana® ER product has new dosage form exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. In addition, because IMPAX’s application referred to patents owned by Penwest Pharmaceuticals, Inc., the Company’s marketing partner for Opana® ER, and contained a Paragraph IV certification under section 355(j) of the Act, we believe IMPAX’s notice triggered the 45-day period under the Act in which the Company and Penwest could file a patent infringement action and trigger the automatic 30-month stay of approval. Subsequently, on January 25, 2008, the Company and Penwest filed a lawsuit against IMPAX in the United States District Court for the District of Delaware in connection with IMPAX’s ANDA. The lawsuit alleges infringement of certain Orange Book-listed U.S. patents that cover the Opana® ER formulation. Additionally, the lawsuit previously filed by the Company and Penwest on November 15, 2007 against IMPAX remains pending. We cannot predict the outcome of this litigation.

 

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In February 2008, we along with our partner Penwest, received a notice from Actavis South Atlantic LLC advising of the filing by Actavis of an ANDA containing a Paragraph IV certification under 21 U.S.C. Section 355(j) for oxymorphone hydrochloride extended-release tablets CII. The Actavis Paragraph IV certification notice refers to Penwest’s U.S. Patent Nos. 5,128,143, 5,662,933, 5,958,456, and 7,276,250, which cover the formulation of Opana® ER. These patents are listed in the FDA’s Orange Book and expire in 2008, 2013, 2013, and 2023, respectively. In addition to these patents, Opana® ER has a new dosage form (NDA) exclusivity that prevents final approval of any ANDA by the FDA until the exclusivity expires on June 22, 2009. The Company and Penwest are currently reviewing the details of this ANDA from Actavis. The Company and Penwest note that they intend to pursue all available legal and regulatory avenues in defense of Opana® ER, including enforcement of their intellectual property rights and approved labeling.

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