International Thyroid Awareness Week 2010 to Focus on Thyroid Disorders and Pregnancy

GENEVA, May 25, 2010 - Merck Serono, a division of Merck KGaA, Darmstadt, Germany,
today announces that in the framework of the second International Thyroid
Awareness Week 2010, the company will support an information campaign
focusing on thyroid disorders and pregnancy. From May 24 to May 30, 2010, the
company and its affiliates worldwide will organize educational activities and
public information sessions.

During the pregnancy period, the change of physiological and
hormonal balance may alter the thyroid function and trigger the development
of transient or permanent thyroid disorders in women who are at risk.
Uncontrolled maternal hyperthyroidism and hypothyroidism as well as iodine
deficiency can result in complications during the pregnancy, the delivery of
the baby, and potentially impact the good development of the fetus.

As demonstrated in a recent European survey (1) conducted with
over 1,700 women, aged 18 - 44 years, from five European countries (2), there
is a significant lack of understanding about the vital role the thyroid gland
plays in pregnancy. 58% of responders did not know the potential risks of
untreated thyroid disorders during pregnancy.

"Thyroid dysfunctions can greatly affect patients' quality of
life, but they often go unnoticed due to a misinterpretation of the common
symptoms, especially during pregnancy, when they can be easily mistaken for
the physical and emotional changes linked to pregnancy itself. Undiagnosed
female patients that become pregnant and do not receive the appropriate care,
run significant risks for their health and for their baby," said Bernhard
Kirschbaum, Executive Vice President, Research and Development at Merck
Serono. "Merck Serono is pleased to provide for the second year its support
to healthcare professionals and patients through this global information
campaign."

The two most common thyroid conditions are hypothyroidism,
when the body produces too little thyroid hormone, and hyperthyroidism when
the body produces too much thyroid hormone. Thyroid disorders can be
confirmed by a healthcare provider through a blood test, and managed through
oral medication. For severe cases of hyperthyroidism, treatment may also
include irradiations or surgery.

The International Thyroid Awareness Week is a campaign
supported by Merck Serono in cooperation with Thyroid Federation
International, and endorsed by the European Thyroid Association, the Latin
American Thyroid Society and the Chinese Society of Endocrinology. In 2009,
the first International Thyroid Awareness campaign was successfully rolled
out in over 30 countries, in collaboration with local patient organizations
and members of the medical community.

Further information on thyroid disorders and pregnancy are
available on: www.thyroidweek.com

About Merck Serono

Merck Serono is the division for innovative prescription
pharmaceuticals of Merck KGaA, Darmstadt, Germany, a global pharmaceutical
and chemical company. Headquartered in Geneva, Switzerland, Merck Serono
discovers, develops, manufactures and markets innovative small molecules and
biopharmaceuticals to help patients with unmet medical needs. In the United
States and Canada, EMD Serono operates through separately incorporated
affiliates.

Merck Serono has leading brands serving patients with cancer (Erbitux(R),
cetuximab), multiple sclerosis (Rebif(R), interferon beta-1a), infertility
(Gonal-f(R), follitropin alfa), endocrine and metabolic disorders (Saizen(R)
and Serostim(R), somatropin), (Kuvan(R), sapropterin dihydrochloride) as well
as cardiometabolic diseases (Glucophage(R), metformin), (Concor(R),
bisoprolol), (Euthyrox(R), levothyroxine). Not all products are available in
all markets.

With an annual R&D expenditure of more than EUR 1 billion,
Merck Serono is committed to growing its business in specialist-focused
therapeutic areas including neurodegenerative diseases, oncology, fertility
and endocrinology, as well as new areas potentially arising out of research
and development in autoimmune and inflammatory diseases.

About Merck

Merck is a global pharmaceutical and chemical company with
total revenues of EUR 7.7 billion in 2009, a history that began in 1668, and
a future shaped by approximately 33,600 employees in 64 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 www.merckserono.com
or www.merck.de

(1) TNS omnibus survey, conducted March 2010

(2) Austria, France, Germany, Poland and Spain

Merck Serono S.A., Geneva, 9 Chemin des Mines, 1202 Genève, Suisse, Media relations, Tel: +41-22-414-36-00