Merck Sharp & Dohme Limited (MSD) is the UK subsidiary of Merck & Co., Inc., of Whitehouse Station, New Jersey, USA, a leading research-based pharmaceutical company that discovers, develops, manufactures and markets a wide range of innovative pharmaceutical products to improve human health.

MSD has committed substantial investment to research and manufacturing in the UK because of the unrivalled scientific excellence and skills base available here. It has two sites in the UK: headquarters and pharmaceutical research and development laboratories in Hoddesdon, Hertfordshire; and manufacturing at Cramlington in Northumberland.