I have not seen any threads on the use of acupuncture for prevention. I have had acupuncture during a migraine attack and I've had success usually a couple of hours after the needles. I'm tired of all the complications and side effects of all the drugs I've tried. A combination of imitrex and fioricet are usually very effective for me, but I suffer from rebound headaches if I use them more than 2 days a week. I end up doing that fairly often because the pain gets to be unbearable and then it can take several days to finally "get over" a migraine.