migraine prevention
"This is one of the medicines I cycle through for my migraine control.  My body gets "used" to them, so about every 4-6 months I have to change drugs.  Fortunately I can rotate back after about a year off.  This is one of my favorites, because the side effects don't interfere too much with my day-to-day life.  Tingling in the hands and feet, decreased appetite, and a bit of increased anxiety (but manageable).  For me, the benefits of having my migraines under control (ones that went on for days and weeks, 7-9 scale pain on a regular basis), far outweigh the cost of the side effects."