Extension of Prior Study Evaluating Safety and Tolerability of Two Doses of Betaseron® to Treat Relapsing-remitting Multiple Sclerosis

250 mcg administered s.c.(subcutaneous) every other day

250 mcg administered s.c. every other day (for patients having received 500 mcg before)

500 mcg administered s.c. every other day

500 mcg administered s.c. every other day (for patients having received 250 mcg before)