Swedish specialty pharmaceutical company Orexo announced today the submission of a New Drug Application for Zubsolv™ (OX219) to the US FDA

Orexo is the first company to submit a New Drug Application (NDA) for a novel
combination product of buprenorphine and naloxone for treatment of opioid
dependence, a condition affecting over two million Americans.
The development of Zubsolv (OX219), a product comprising buprenorphine and
naloxone based on Orexo’s proprietary sublingual drug delivery technology, has
progressed well and faster than originally anticipated. A total of four clinical
studies were completed in support of the filing, along with a CMC product
stability program covering two independent manufacturing sites.

“Today´s FDA submission, the third in our short history, constitutes a
substantial milestone. Very few companies of our size and lifetime have ever
managed to complete three development programs, Edluar™, Abstral® and now
Zubsolv. Orexo will potentially be the first company to offer an alternative
treatment option to Suboxone®, which reached sales of USD 1.3 billion in 2011
and continues to exhibit steady growth of more than 15 per cent annually.

The earlier submission is expected to be of major commercial importance, as it
provides a potential launch of Zubsolv in the third quarter of 2013 – ahead of
other branded competitors. In our clinical studies Zubsolv has demonstrated an
accelerated dissolve time, has a smaller tablet size and an improved taste,
resulting in a strong preference in comparison with the Suboxone tablet. Our
market insights indicate that these properties, which are important product
characteristics for particularly sublingual therapies, will be important drivers
for the market uptake of the product and we estimate peak sales to reach USD 500
million annually”, says Anders Lundström.

Opioid dependence is increasingly recognized as a major health problem in the
US, with over two million Americans affected, costing the society an estimated
USD 25 billion in related health care cost. The Zubsolv (OX219) treatment option
will, once approved by the FDA, be directed towards the authorized specialized
prescribers of Suboxone in US, of which 5000 physicians account for about 90% of
all US prescriptions.

“With the NDA submission for Zubsolv (OX219) five months ahead of schedule, we
will now finalize our US commercialization plans for the brand to ensure that
the substantial value of Zubsolv (OX219) will be realized”, continues Anders
Lundström, CEO of Orexo.

For further information, please contact:
Anders Lundström, President and CEO
Tel: +46 706-67 22 66, E-mail: anders.lundstrom@orexo.com

About Orexo
Orexo AB is an emerging specialty pharma company developing improved treatments
using proprietary drug delivery technology. Orexo’s expertise is within the area
of reformulation technologies and especially sublingual formulations. The
company has a portfolio of revenue-generating EU and US approved products
currently marketed under licence and a pipeline of several reformulations of
approved compounds for areas of unmet medical need. Orexo also has collaboration
projects with several international pharma companies. Orexo AB, with its
headquarters in Sweden, is listed on NASDAQ-OMX. The largest shareholders are
Novo A/S and HealthCap.

About Zubsolv™ (OX219)
Zubsolv is a novel sublingual formulation of buprenorphine and naloxone using
Orexo’s extensive knowledge in sublingual technologies. Zubsolv is intended for
maintenance treatment of people suffering from opioid dependence. Through
application of its proprietary technologies Orexo has increased the
bioavailability of the active ingredient, accelerated dissolve time, reduced
tablet size and improved taste resulting in a preference of Zubsolv in
comparison with Suboxone tablet. Zubsolv has the potential to be the first new
entrant into a USD 1.3 billion market, with more than two million patients
suffering from opioid dependence and where a majority of patients are not
adequately treated today. Market potential for Zubsolv is at peak estimated at
USD 500 million in sales annually.

For more information about Orexo please visit www.orexo.com

Orexo is required under the Financial Instruments Trading Act to make the
information in this press release public. The information was submitted for
publication at 1 pm CET on September 6, 2012.