In Group 1: 5 mg flunarizine every 24 hours (at 8:00 p.m.), beginning on Day -42 for 6 weeks, through Day -1. Patients will continue to receive this dose from Days 1 through 81. Group 1a: On Day 4 Topiramate dose titrated from 25 mg BID to 75 mg (25 mg am and 50 mg pm) by Day 19 and 50 mg BID by Day 26 - Day 81. Group 1b continue on Flunarizine only. Group 2: Topiramate beginning Day 2 titration from 25 mg BID to 50 mg BID by Day 5 through 18. 5mg Flunarizine daily starting Day 12- Day 18.