Whilst we have multiple different medications that work as a preventive, for some people nothing seems to work, so it is great to see further options being available:

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This article covers propofol to treat ongoing migraine with a 95% success rate (it's rare to see a figure this high) and how the author used propofol to treat CH with successful results where other approaches have failed.

This is interesting, but hardly a viable treatment for most of us. A good idea to save a copy in case you get to an ER.