Additional Relevant Details At baseline, patients enrolled in this study were experiencing approximately 18 migraine days per month. Patients were randomized to receive either placebo, or one of two erenumab doses — 70 mg or 140 mg — subcutaneously, once monthly. Patients experienced a 6.6-day reduction from baseline in monthly migraine days in each of the erenumab treatment arms as compared to a 4.2-day reduction in the placebo arm, a statistically significant reduction in each erenumab treatment arm.