The Multicenter, Open-label, Single-use Autoinjector Convenience Study

Inclusion Criteria

• Male and female subjects, 18-65 years of age, inclusive, at the time of informed consent signature
• RMS diagnosed according to the McDonald criteria
• Currently receiving Rebif® 44mcg sc tiw using manual injections and/or Rebiject II autoinjector for greater than twelve weeks
• Capable of self-injecting using the single-use autoinjector
• Be willing and able to comply with the study procedures for the duration of the trial
• Have given written informed consent and signed Health Insurance Portability and Accountability Act (HIPAA) Authorization before any study-related activities are carried out
• Female subjects must not be either pregnant or breast-feeding and must lack childbearing potential

Exclusion Criteria

• Have used any other injectable medications (i.e. for pain) on a regular basis during the week prior to Screening or throughout the duration of the trial (the administration of a single injection for treatment or prophylaxis of a condition unrelated to MS or Rebif® therapy (e.g., influenza or pneumococcus vaccination) will be acceptable)
• Have received MS therapy other than Rebif® within twelve weeks prior to Screening or at any time during the trial (e.g., other disease modifying drugs, Rebif® New Formulation, combination therapy, immunomodulatory and/or immunosuppressive agents, including but not limited to any interferon, glatiramer acetate (Copolymer I), cyclophosphamide, cyclosporine, methotrexate, linomide, azathioprine, mitoxantrone, teriflunomide, laquinimod, cladribine, total lymphoid irradiation, anti-lymphocyte monoclonal antibody treatment (e.g. natalizumab, alemtuzumab/Campath, anti- CD4), Intravenous immunoglobulin (IVIg), cytokines or anti-cytokine therapy) and telbivudine
• Have inadequate liver function, defined by a alanine aminotransferase (ALT) > 2.5x upper limit of normal (ULN), or alkaline phosphatase > 2.5x ULN, or total bilirubin > 2.5x ULN
• Have inadequate bone marrow reserve, defined as a total white blood cell count < 3.0x 109/L, platelet count < 75x109/L, haemoglobin < 100g/L
• Have complete transverse myelitis or bilateral optic neuritis
• Have a history of alcohol or drug abuse
• Have thyroid dysfunction
• Have moderate to severe renal impairment
• Have a major medical or psychiatric illness that in the opinion of the investigator creates undue risk to the subject or could affect compliance with the study protocol
• Have a history of seizures not adequately controlled by treatment
• Have serious or acute cardiac disease, such as uncontrolled dysrhythmias, uncontrolled angina pectoris, cardiomyopathy, or uncontrolled congestive heart failure
• Have, in the opinion of the investigator, any visual, physical or cognitive impairment that would preclude the subject from self-injecting with the single-use autoinjector
• Have a known hypersensitivity or allergy to interferon-beta or any of the excipients
• Have participated in another clinical trial within the past thirty days
• Are pregnant or attempting to conceive