Generally the condition is caused due to certain viruses. Generally the condition is self correcting and does not need to be treated with antibiotics, unless associated with bloody diarrhea. Your doctor has decided to play safe and has decided to give Ornoff-Oz. However, if the child does not tolerate it well and vomits it out, you can stop giving the medicine altogether. I would not prefer giving him another 1/2 tablet. You may also give plenty of curd or yogurt. It contains plenty of beneficial bacteria, same as that contained by Bilfilac, and is supposed to be helpful in such a situation. Give ORS (Oral Rehydration Solution) and plenty of other fluids. Replenishment of the lost water and salts as the mainstay of treatment. Treatment is not supposed to bring down the frequency of passage of loose stools. The adequacy of the hydration would be evident from the frequency of passage of urine. If that seems to be fine, you need not worry. But unless the child grows lethargic, I would not get concerned. It may still take 3-7 days (from the onset) to stop. You may give zinc supplementation with Zinconia Syr 2.5ml twice daily for 5 days. It will help in the intestinal healing as the diarrhoea causes some damage to the inner wall of the intestines. It is preferrable to avoid milk and wheat based items for a week or so (curd or yogurt can be given).