New Formulation of Multiple Sclerosis Treatment Rebif(R) Approved in European Union


GENEVA, Switzerland, August 30 /PRNewswire/ --

- New Formulation of Rebif(R) Designed to Improve Injection Tolerability

Merck Serono, a division of Merck KGaA, announced today that the European
Commission has granted a marketing authorization for a new formulation of
Rebif(R) (interferon beta-1a) for the treatment of relapsing multiple
sclerosis (MS). The new formulation of Rebif(R) has been developed to
increase treatment benefit by improving injection tolerability while
targeting an improved immunogenicity profile. This new formulation originates
from an innovative approach, using state-of-the-art technologies.

"The European approval of the new formulation of Rebif(R) is
an important step in our efforts to continuously provide enhanced therapeutic
solutions for patients with MS," said Roberto Gradnik, Head of Merck Serono's
Operations for Europe. "We are pleased to bring this enhanced treatment
option to patients throughout Europe."

The European Commission decision applies to all 27 countries
in the European Union(1), as well as Iceland, Liechtenstein and Norway.
Launches of the new formulation of Rebif(R) in the various countries of the
European Union will start in September 2007. The new formulation of Rebif(R)
will be available in the same strengths and pharmaceutical forms as currently
registered, i.e. 8.8, 22 and 44 mcg, as a solution for injection in
pre-filled syringes.

"The European approval of the new formulation of Rebif(R) is
good news for patients with MS," said Professor Per Soelberg Sørensen, Danish
Multiple Sclerosis Research Center, Department of Neurology, Copenhagen
University Hospital. "This new formulation will represent an improvement in
the therapy of MS patients being treated with Rebif(R)."

Rebif(R), which was originally approved in Europe in 1998, has been
proven effective on the following three key measures of treatment
effectiveness: MRI lesion area and activity, relapse rates, and disability
progression. The safety and efficacy of Rebif(R) are supported by a robust
long-term clinical development program including comparative studies and 13
years of patient experience from around the world.

The new formulation of Rebif(R) is the latest of many product
developments from Merck Serono to continuously enhance the convenience and
tolerability of Rebif(R). Other enhancements have included the Rebiject II
auto-injector to facilitate injections; a 29 gauge-5 bevel needle pre-filled
syringe, the thinnest needle in a ready-to-use pre-filled syringe for the
treatment of MS; and a titration pack designed to make starting on Rebif(R)
therapy easier and more convenient.

(1) Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, The Republic of Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, United Kingdom

About Rebif(R)

Rebif(R) (interferon beta-1a) is a disease-modifying drug used to treat
relapsing forms of multiple sclerosis (MS) and is similar to the interferon
beta protein produced by the human body. Interferon helps modulate the body's
immune system, fight disease and reduce inflammation.

Rebif(R), which was approved in Europe in 1998 and in the US
in 2002, is registered in more than 80 countries worldwide. Rebif(R) has been
proven to delay the progression of disability, reduce the frequency of
relapses and reduce MRI lesion activity and area(1). Rebif(R) is not approved
for treatment of chronic progressive MS. Rebif(R) is available in a 22 mcg
and 44 mcg ready-to-use pre-filled syringe and a titration pack (8.8 mcg).

Most commonly reported side effects are injection site disorders,
flu-like symptoms, elevation of liver enzymes and blood cell abnormalities.
Patients, especially those with depression, seizure disorders, or liver
problems, should discuss treatment with Rebif(R) with their doctors.

About Merck Serono and multiple sclerosis

Merck Serono is a leader in multiple sclerosis (MS) with
Rebif(R) (interferon beta-1a), a disease-modifying drug used to treat
relapsing forms of MS, which is registered in more than 80 countries
worldwide. In addition to Rebif(R), the Company also offers a second therapy
within its US portfolio of MS therapies: Novantrone(R) (mitoxantrone for
injection concentrate) for worsening forms of MS. Full prescribing
information for these products can be obtained by contacting the Company or
visiting its website. Additional therapeutic options are currently under
development at Merck Serono, including oral cladribine, currently in Phase
III and potentially the first oral therapy for MS, as well as several
products in early stage development. Merck Serono also is taking a leading
role in developing an understanding of the role of genetics in MS.

About multiple sclerosis

Multiple sclerosis (MS) is a chronic, inflammatory condition
of the nervous system and is the most common, non-traumatic, neurological
disease in young adults. The World Health Organization estimates that up to
2.5 million people suffer from MS worldwide. While symptoms can vary, the
most common symptoms of MS include blurred vision, numbness or tingling in
the limbs and problems with strength and coordination. The relapsing forms of
MS are the most common.

Forward-looking statements

Some of the statements in this press release are forward
looking. Such statements are inherently subject to known and unknown risks,
uncertainties and other factors that may cause actual results, performance or
achievements of Merck Serono S.A. and affiliates to be materially different
from those expected or anticipated in the forward-looking statements.
Forward-looking statements are based on Merck Serono's current expectations
and assumptions, which may be affected by a number of factors, including
those discussed in this press release and more fully described in Serono's
Annual Report on Form 20-F filed with the U.S. Securities and Exchange
Commission on February 28, 2006. These factors include any failure or delay
in Merck Serono's ability to develop new products, any failure to receive
anticipated regulatory approvals, any problems in commercializing current
products as a result of competition or other factors, our ability to obtain
reimbursement coverage for our products, the outcome of any government
investigations and litigation. Merck Serono is providing this information as
of the date of this press release, and has no responsibility to update the
forward-looking statements contained in this press release to reflect events
or circumstances occurring after the date of this press release.

About Merck Serono

Merck Serono, the new division for innovative small molecules and
biopharmaceuticals of Merck was established following the acquisition of
Serono and the integration of its business with the former Merck Ethicals
Division. Headquartered in Geneva, Switzerland, Merck Serono discovers,
develops, produces and commercializes innovative products to help patients
with diseases with unmet needs. Our North American business operates in the
United States and Canada under EMD Serono.

Merck Serono has leading brands serving patients with cancer
(Erbitux(R)), multiple sclerosis (Rebif(R)), infertility (Gonal-f(R)),
metabolic and cardiometabolic disorders (Glucophage(R), Concor(R), Saizen(R),
Serostim(R)), as well as psoriasis (Raptiva(R)). With an annual R&D
investment of EUR 1bn, we are committed to growing our business in
specialist-focused therapeutic areas such as Neurology and Oncology, as well
as new therapeutic areas potentially arising out of our research and
development in autoimmune and inflammatory diseases.

About Merck

Merck is a global pharmaceutical and chemical company with sales of EUR
6.3 billion in 2006, a history that began in 1668, and a future shaped by
35,091 employees in 62 countries. Its success is characterized by innovations
from entrepreneurial employees. Merck's operating activities come under the
umbrella of Merck KGaA, in which the Merck family holds an approximately 70%
interest and free shareholders own the remaining approximately 30%. In 1917
the U.S. subsidiary Merck & Co. was expropriated and has been an independent
company ever since.

For more information, please visit http://www.merckserono.net or
http://www.merck.de

(1) The exact correlation between MRI findings and the current or future
clinical status of patients, including disability progression, is unknown.

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