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

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

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

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 …

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

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

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® (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 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 …