Merck Serono S.A. discovers, develops, manufactures, and commercializes prescription medicines focusing on various therapeutic areas that include oncology, immuno-oncology, immunology, multiple sclerosis, fertility, endocrinology, biosimilars, and neglected diseases. It develop treatments to help manage neurodegenerative diseases, such as multiple sclerosis; colorectal cancer; drugs to treat head and neck cancer; fertility drugs for every stage of the reproductive cycle.