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

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

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 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 …

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.

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

Find answers to questions about managing symptoms, storage, and the administration of AVONEX®. See Safety and Prescribing Info.