A Postmarketing Surveillance (PMS) Study to Evaluate the Extent to Which Patient Compliance is Influenced by Use of a Variable Titration Regimen at the Start of Treatment of Relapsing Multiple Sclerosis (MS) With Interferon Beta 1a (Rebif®)

Subjects first received Interferon beta-1a at a dose of 22 µg x3 over a period of 4 weeks. An attempt was then made to increase the dose of interferon beta-1a to 44 µg x3 as a self-administered subcutaneous (s.c.) injection. If intolerable interferon-specific side effects or problems of acceptance occured, the treatment with Rebif 22 µg three times weekly was continued.