Biogen Idec (Cambridge, MA) and Acorda Therapeutics, Inc. (Hawthorne, NY) have entered into an exclusive collaboration and license agreement to develop and commercialize Fampridine-SR, a multiple sclerosis (MS) therapy, in markets outside the United States. Fampridine-SR is a novel, oral sustained-release compound being developed to improve walking ability in people with MS. The companies also have entered into a related supply agreement. The transaction represents a sublicensing of an existing license agreement between Acorda and Elan Pharma International Limited, a subsidiary of Elan Corporation plc (Dublin, Ireland).