Evaluate the Safe and Effective Use of the Avonex® Single-Use Autoinjector in Multiple Sclerosis Subjects

The Main Study was a 4-week treatment period which consisted of 1 Avonex manual injection using a prefilled syringe, followed by 3 Avonex injections using the single-use autoinjector. The Extension Study was designed to provide continuation of treatment with the Avonex single-use autoinjector to eligible participants who completed the Main Study for up to an additional 12 weeks, and to obtain additional safety and preference data for the Avonex single-use autoinjector.

Participants were enrolled under the initial study protocol (Initial Subject Subset); the study was subsequently suspended. Changes were made to the protocol (including modifications to the autoinjector needle), and additional participants were enrolled (Main Subject Subset).

Inclusion criteria

• Ability to understand the purpose and risks of the study and provide signed and dated informed consent and authorization to use protected health information (PHI) in accordance with national and local subject privacy regulations.
• Must be 18 to 65 years old, inclusive, at the time of informed consent.
• Must currently be self-administering Avonex Prefilled Syringes to treat MS and must have been self-administering Avonex Prefilled Syringes for the 12 weeks prior to the Screening Visit.
• In the investigator's opinion, subjects must be willing and able to self-administer all injections required by the protocol.
• Must speak English.
• All male subjects and female subjects of child-bearing potential must practice effective contraception during the study.

Exclusion criteria

• History of seizure disorder or unexplained blackouts OR history of a seizure within 3 months prior to the Screening Visit.
• History of suicidal ideation within 3 months prior to Day 1 or an episode of severe depression within 3 months prior to Day 1. Severe depression is defined as any episode of depression that requires hospitalization, or the initiation of antidepressant therapy, or an increase in the dose of an existing regimen of antidepressant therapy. NOTE: Subjects receiving ongoing antidepressant therapy are not excluded from the study unless the dose has been increased within the 3 months prior to the Screening Visit.
• Clinically significant local infection (for example cellulitis, abscess) or systemic infection (pneumonia, septicemia), at the discretion of the Investigator.
• Known history of Human Immunodeficiency Virus (HIV).
• Known history of, or positive test result for hepatitis C virus (test for hepatitis C virus antibody [HCV Ab]) or Hepatitis B virus (test for Hepatitis B Surface Antigen [HBsAg] and/or Hepatitis B Core Antibody [HBcAb]).