Merck KGaA, Darmstadt, Germany is the leading international company in the thyroid field. Our products such as Euthyrox (Levothyroxine Sodium) are marketed all over the world.Since 1894 we have been dedicating our efforts towards the efficient diagnosis and therapy of thyroid diseases for the welfare of patients. We support thyroid specialists with a broad range of services. This website provides an overview of our activities and facilitates access to thyroid-related information on the Internet. Last update: Aug. 1, 2000