Some claim Butterburr extract can help. It is available at the health food store. But, I don't find it or other remedies strong enough for Migraines. There are some products in health food stores that can lessen the severity. I find that codeine helps more than anything, I have ever used. You must get a prescription in the U.S. for Fioricet to obtain codeine pills. But it is available, over-the-counter in any pharmacy, in many countries. In England, there are about 10 products, such as "Migraleve", available in a pharmacy with codeine. There are many products on ebay, sometimes they even work, but watch out most are junk.
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