In the past, I've only used Zofran once my son has started vomiting. A couple of days ago, my nonD son was up all night vomiting...and my thoughts, as always, turned to Daniel and worried about him catching it. So, for the past two days, I've given him a Zofran. His BG has been a little weird...lows not responding to treatment as if the carbs are not absorbing...and he did complain about his tummy hurting a couple of times...which prompted my giving him the Zofran. My older son is doing much better today, and has not vomited since Friday morning. My question is...if you give Zofran preventively...how long do you continue doing it? I know with stomach viruses you can still be contagious after you recover...but I really don't want to give the Zofran unnecessarily. Daniel still seems fine...but I really want to avoid the vomiting if we can. Also, if you have given Zofran to avoid vomiting, have you ever still seen weird BGs...like carbs are not absorbing? I don't know exactly how Zofran works in the body...is it just preventing the vomiting, but not all the digestion issues caused by a virus?