The official site for AVONEX®, a long-established treatment option for relapsing Multiple Sclerosis. Also see Important Safety and Prescribing Info.

How to take AVONEX One injection, once a week AVONEX is a once-weekly treatment for relapsing multiple sclerosis (MS), offering you the flexibility to choose the day that works best for you. Talk to …

Understand the potential benefits of AVONEX® as well as safety risks, side effects and efficacy. See Safety and Prescribing Info.

These highlights do not include all the information needed to use AVONEX safely and effectively. See full prescribing information for AVONEX.

Find resources about AVONEX® for healthcare professionals, including MS patient assistance, Start Forms, and how Biogen can help offer patient support.

Learn more about the most common and potential serious side effects with AVONEX® treatment. See Safety and Prescribing Info.

AVONEX® (a-vuh-necks) (interferon beta-1a) Injection for intramuscular use Read this Medication Guide before you start using AVONEX, and each time you get a refill. There may be new information. …

AVONEX® (interferon beta-1a) is indicated for the treatment of relapsing forms of multiple sclerosis (MS), to include clinically isolated syndrome, relapsing-remitting disease, and active secondary …

AVONEX® (a-vuh-necks) (interferon beta-1a) injection for intramuscular use single-dose prefilled syringe Read the Instructions for Use before you start using AVONEX and each time you get a refill. …

AVONEX is a prescription medicine used to treat relapsing forms of multiple sclerosis (MS), to include clinically isolated syndrome, relapsing-remitting disease, and active secondary progressive disease …