If anybody is interested, I recently read an academic article in American Family Medicine about the efficacy of various anti-emetics in the treatment of gastro and Norwalk-like viruses (NLV)

Here is the link: http://www.aafp.org/afp/2004/0301/p1169.html

"Intestinal irritation is a frequent cause of nausea. Agents such as Norwalk virus, rotavirus, and Salmonella species cause 1.2 intestinal infections per person per year.14 Medications such as aspirin and ferrous sulfate can cause nausea through visceral stimulation. Because visceral fibers are mediated primarily by serotonin, 5-HT3 antagonists are effective in the treatment of these disorders.14 Anecdotal reports also indicate significant success for treatment with dopamine antagonists, which may be more cost-effective first-line agents than serotonin antagonists."

Dopamine antagonist anti-emetics would be Reglan, Zofran, Compazine. Zofran is also a 5ht3 antagonist, but the cost for 5ht3 anti-emetics range from "$17-195 per pill." Reglan is a serotonin antagonist.