Efficacy and Safety of Teriflunomide in Patients With Relapsing Multiple Sclerosis and Treated With Interferon-beta

The study period per patient was expected to be between 56 and 160 weeks depending on when the patient was randomized and this included the following: * a screening period up to 4 weeks, * a treatment period expected to be between 48 and 152 weeks, * 4-week post rapid elimination follow-up period. Patients were to continue on treatment until a fixed common end date which was approximately 48 weeks after randomization of the last patient. For those patients who completed the treatment period, a long term extension study of approximately 1 year (including teriflunomide alone) was initially planned to be proposed.