Ondansetron
"My teen daughter had the flu & was throwing up to the point of the dr possibly sending her to the ER for an iV even a sip of wAter caused her to vomit immediately.  They decided to try this drug first...it is a miracle!!!!  she was up walking around within 2 hrs & did not vomit again.   She was even able to show her horses at the fair the next day tho drinking strictly pedialyte, Gatorade G2 & Powerade zero for electrolytes (we had to start liquids by waiting 1 Hr after she vomited, then 5-10 ml every 5-10 minutes... Added this as I feel it may be helpful to others).  I am going to ask my Dr for a prescription for the future, I wish I knew about this a long time ago!  I filled the prescription at Sam's club 5 pills about $4 & worth it"