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

Find important information on the dosing and administration of AVONEX®, including instructions on using the AVONEX PEN®. See Safety and Prescribing Info.

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 …

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.

Check the expiration date printed on the AVONEX PEN, AVONEX PEN Administration Dose Pack carton, and the outer carton. Do not use the AVONEX PEN past the expiration date.

Access information on the AVONEX® dosing and administration schedule and injection options. See Safety and Prescribing Info.

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

• Autoimmune diseases. Problems with easy bleeding or bruising (idiopathic thrombocytopenia), thyroid gland problems (hyperthyroidism and hypothyroidism), and autoimmune hepatitis have happened in …

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 …