Posted by KevinB (12.75.40.102) on August 12, 2001 at 19:36:12:
My doctor put me on Oxygen (15 liters / min) and it
has been 100% effective within about 4 minutes. At the
first hint of a CH, I take my Imitrex and put on the O2
mask. It seems to provide complete but only temporary
relief, thankfully long enough for the Imitrex to
engage. It's great to finally have something that
brings some quick relief.