Ondansetron
"Absolutely a life saving drug. I am a student in university and have had ongoing undiagnosable stomach problems for four years. I still miss a lot of school but with this drug, I can put weight on finally. Every now and again it flares up really bad and I will take 8 mg at a time. Otherwise, I take 4 mg about twice a day, once when I wake up and once after my midday meal. I rarely get the headaches because I take the tablets and not the ODTs. There's an artificial sugar in the ODT that supposedly causes the headaches. If a sudden bout of nausea occurs, it will go into effect in 30-45 mins for me."