Here's someone talking about a dose of 2000mg taurine to abort attacks. Taurine to stop onset of Cluster Headache - General Board - ClusterBusters
It's hard to tell how much taurine is in a 5-Hour Energy shot, but one place lists it as roughly 480mg. An 8-ounce Red Bull is said to have 1000mg of taurine.
This is another discussion of taurine: Taurine Supplements - General Board - ClusterBusters
If you put taurine into the search bar at the top right of any page, you'll see quite a few entries, of which some might be helpful, although most don't mention specific dosages.