WebMD Answers
Methergine (methylergonovine) is an "ergotamine" type of medication. It is on the market as a treatment for uterine bleeding (that is the FDA approved use). Similar medications were used to treat headaches in the past. It should work for migraine.
It is a very strong blood vessel constrictor, and has a number of serious side effects (some of the side effects caused by long term use could be permanent).
We don't use this medication in our clinic, so I'm not sure how long it should take to work.
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