Hi. Thanks for your query, albeit short and specific. Noted the history about your 4 year old son and understood your concerns. Cefixime is still one of the drug of choice for intestinal infection and hence you may please continue with the medications that your Doctor has told your son to be taken. But since the child is just 4 years old, it is imperative to carry on the following for an early diagnosis: Tests of stool and blood. Ultrasonography of the abdomen for ruling out other possible causes of pain in abdomen in children: Appendicitis, lymph node enlargement. Worm infestation and so on and to get him treated accordingly. Ask your son to eat nothing from outside source. Give him boiled and cooled water admixed with electrolyte solutions. Soft bland diet if vomiting stops.