I've only been on it for 12 days, starting at 50mg a day for the first week and 100mg starting the 2nd week. The pain started on day 7 and has not gone away - the most severe today! I don't know if I should just hang in there and hope it gets better or try going back to 50mg and see if gets better. I've had chronic migraine for 30 yrs and would really like to give this a chance - so far I'm not sure... Thank You! I never knew there were other migraine sufferers out there like me until I came across this site!