Orexo announces dosing of first patient with OX51 in phase II clinical trial on prevention of procedure-induced pain

| Source: Orexo AB
Swedish specialty pharmaceutical company Orexo today communicated the start of
the dose finding study for OX51 in patients undergoing prostate biopsy. Results
from the study, which is a European study enrolling approximately 200 patients,
will be available during the first half of 2013.
OX51 is a novel breakthrough innovation from Orexo, which has been developed to
meet the fast growing demand for efficient pain management during short-term
surgical and invasive diagnostic procedures. OX51 is a sublingual formulation of
alfentanil, based on the leading sublingual delivery technology developed by
Orexo. The quick onset, short duration, rapid offset and convenient
administration of OX51 make it suitable for prevention of pain during a
multitude of procedures.

The market for short-term surgical and diagnostic procedures is large and
growing with over 130 million procedures performed annually in the US and EU.
The growth is driven by both improvement in technology, and a result of an
increasing cost control, which propels a shift in such procedures from an in
-patient/hospital setting towards an outpatient setting. This shift has created
a major need for improving efficient pain management during the short-term
surgical and diagnostic procedures without the full access to all resources
otherwise found in a hospital.

“OX51 is yet another innovation from Orexo providing the first oral formulation
of alfentanil and meeting a fast growing need from patients and health care
providers. Feedback from doctors is universally positive to the product
characteristics of OX51 and we move forward in the development of this highly
innovative product with great confidence,” said Anders Lundström, CEO. “The dose
finding study will enable Orexo to decide the best possible development strategy
for phase III, which we expect to communicate during first half of 2013 once the
trial has been completed”.

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 US and EU 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 has 100 employees and is listed on NASDAQ-OMX. The
largest shareholders are Novo A/S and HealthCap.

About OX51
OX51, based on the active substance alfentanil, is being developed for the
prevention of acute intensive pain in conjunction with care-related diagnostic
or therapeutic procedures. OX51 is the first oral tablet formulation of
alfentanil and building on the leading expertise in Orexo in sublingual
formulation. OX51 product characteristics are very attractive for pain treatment
during short procedures confirmed in market research among physicians and payers
conducted by Orexo. The annual peak sales potential is estimated at around MUSD

About Prostate Biopsy
There are more than two million procedures of prostate biopsies performed
annually in Europe and the US. Most of these procedures are performed in an
outpatient setting. The diagnostic biopsy procedure is very standardized and
normally involves use of local injection analgesia and use of anesthetic cream,
but the resulting pain management is often inadequate and the procedure is often

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 1:30 pm CET on October 30, 2012.