I found this to be very interesting: Taken from Patent 6485758
Small abstract: A cure for a hangover containing the active ingredient ephedrine in powdered form enclosed in a capsule. In a second embodiment this cure contains ephedrine and charcoal, while in a third embodiment, this cure contains Ephedra, charcoal and Vitamin B6. The use of any one of the three embodiments reduces the symptoms associated with alcohol intoxication and hangovers thereby speeding up recovery. The Ephedra, Vitamin B-6 and charcoal may be combined on a wt % ratio of 1:2.5:10. The Ephedra may come in the form of Ma Huang having 6% wt % Ephedra. One type of dosage is in the form of individual capsules having 10 Mg of Ephedra, 25 Mg of Vitamin B-6 and 100 Mg of activated charcoal. The recommended dosage would be two capsules so that users who are experiencing a hangover or alcohol related side effects may take up to 20 Mg of Ephedra, 50 Mg of Vitamin B-6 and 200 Mg of activated charcoal. This cure may also consist of a therapeutic method for curing the effects of alcohol consumption wherein this dosage could be taken after the consumption of alcohol.
The entire study is located here: Hangover treatment - Patent 6485758