Mundipharma and Purdue Pharma Expand Pain Pipeline with New Deal for First-in-Class Sigma-1 Antagonist (S1A or MR309/E-52862) from ESTEVE

The Companies Will Obtain Full Worldwide Development and Commercial Rights for the S1A for the Potential Treatment of Pain

Mundipharma, Purdue and ESTEVE Announced Agreement in 2015 to Bring to Patients Next Generation Products for the Management of Pain

Cambridge (UK)/ Barcelona (Spain)/ Stamford, Conn. (US) – May 16, 2016 –
Mundipharma Medical Company Limited and the independent associated company, Purdue Pharma L.P.,today announced that, following completion of Phase II studies, they have exercised their option and taken over full responsibility from Laboratorios Esteve, S.A.U (ESTEVE) for the clinical, regulatory and commercial development of a potential first-in-class sigma-1 antagonist (S1A or MR309/E-52862).  

Mundipharma, Purdue and ESTEVE recognize there are still unmet needs in treating pain and are committed to developing new therapies. The addition of this asset to the Mundipharma and Purdue pain pipelines continues the growth of the global pain franchise, an area of deep heritage and experience for the network of independent associated companies worldwide.

MR309/E-52862 is a potent and highly selective sigma-1 antagonist that may provide a new way to approach the management of neuropathic pain, one of the most challenging pain conditions to manage. 

Studies suggest that the novel mechanism of action of MR309/E-52862 will be complementary to those of other drugs used in pain management and may therefore support combination usage with other analgesic compounds.

MR309/E-52862 binds to sigma-1 in the brain and central nervous system. To date, activity has been demonstrated in vitro and in vivo in multiple models of neuropathic pain, including nerve injury and diabetic neuropathy. These studies have also proven that there is a direct relationship between dose, target occupancy of MR309/E-52862 in the brain and pharmacological activity.

The comprehensive Phase I program for MR309/E-52862 evaluated the safety, tolerability, pharmacodynamics and pharmacokinetics. ,

Phase II clinical studies conducted in patients treated with MR309/E-52862 evaluated the efficacy profile in the treatment peripheral neuropathy of different etiologies (including from diabetic and post-surgical origins) as well as in moderate to severe acute post-operative pain. The results of these studies are pending publication. Mundipharma will now take the program forward into additional clinical studies to support the ongoing development in multiple models of neuropathy and future registration and commercialization.

Antony Mattessich, Managing Director, Mundipharma International Limited commented on the partnership. “We’re thrilled to expand our partnership with ESTEVE. This strategic collaboration leverages our companies’ individual strengths. Our ability to bring products through the clinical and regulatory process and to successfully commercialize them complements ESTEVE’s focus on discovering novel approaches to the treatment of pain in the laboratory. Mundipharma, Purdue and ESTEVE are equally committed to driving innovation in pain management, so our ongoing collaboration is a natural fit.”

Mark Timney, President and Chief Executive Officer, Purdue Pharma said, “The Sigma-1 antagonism mechanism and MR309/E-52862 specifically hold great promise in treating pain. This acquisition further expands our pain pipeline with another potentially innovative non-opioid, non-NSAID treatment.”

Albert Esteve, Chief Executive Officer, ESTEVE, said: “This partnership with Mundipharma will, we hope, allow patients to have access to a new class of treatment to manage pain. Together, we will foster the development of a first-in-class new molecular entity targeting a novel mechanism of action for pain relief. The alliance with Mundipharma and Purdue strengthens the validation of our innovative first-in-class NME R&D and our mission statement, which is to advance science by establishing novel R&D collaborations and to solve unmet medical needs of diseases with significant social impact.”

About Mundipharma
Mundipharma and independent associated companies are privately owned companies and joint ventures covering the world’s pharmaceutical markets. These companies are committed to bringing to patients the benefits of significant new treatment options in the core therapy areas of pain, respiratory, oncology and inflammatory conditions. Through innovation, design and acquisition, Mundipharma and its independent associated companies deliver important treatments to meet the most pressing needs of patients, healthcare professionals and health systems worldwide. For further information please visit:

About Purdue Pharma L.P.
Purdue Pharma is a privately-held pharmaceutical company and is part of a global network of independent associated companies that is known for pioneering research in chronic pain and opioids with abuse deterrent properties. Purdue Pharma is engaged in the research, development, production and distribution of both prescription and over-the-counter medicines and hospital products. With Purdue Pharma’s expertise in drug development, commercialization, and life-cycle management, the company is diversifying in high-need areas to expand through strategic acquisitions and creative partnerships. For more information, please visit

ESTEVE is a leading pharmaceutical chemical group based in Barcelona, Spain. Since it was founded in 1929, ESTEVE has been firmly committed to excellence in healthcare, dedicating efforts to innovative R&D of new medicines for unmet medical needs and focusing on high science and evidence-based research. ESTEVE has a strong partnership approach to drug discovery, development and commercialisation. The company works both independently and in collaboration to bring new, differentiated best-in-class treatments to patients who need them. The company currently employs 2,300 professionals and has subsidiaries and production facilities in several European countries, USA, China and Mexico. More about ESTEVE at and



Media Inquiries:

Charlotte James
Corporate Communications Lead
Mundipharma International Limited
T: +44 (0) 1223 397 162
Catherine London
Head of Corporate Communications
Purdue Pharma L.P.
T: +1 203 588 7530
Angels Valls
Corporate Communications Head
T: +34 93 446 62 60
Rosie Ireland
Weber Shandwick
T: +44 (0) 207 067 0190



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