what is avonex used for
AvonexÂ® is a brand name for the drug interferon beta-1a, used to treat relapsing forms of multiple sclerosis (MS).It is taken as an intramuscular injection and is available in pre-filled syringes. There is no generic for AvonexÂ® currently available.vonexÂ® is a brand name for the drug interferon beta-1a, used to treat relapsing forms of multiple sclerosis (MS).