<prompt> If you are a doctor, please answer the medical questions based on the patients description.My 4 yr old boy weight16 kgcomplains about stomach ache since yesterday morning.Also he had fever 100 degree yesterday night.He also vomited twice today early in the morning.I would like to know is it because of food poisoning or something else and also what the medicine i can give him???  <response>: Welcome to the ChatDoctorIt seems that your child is suffering from gastroenteritis. It may be a self limiting viral infection or a food poisoning if he had taken anything contaminated orally in past 1-2 days. Dont worry as both these conditions require just symptomatic treatment and a good HY Chat Doctor. They usually improve within a few days. At present, you may take the following measures to help him out:1. Give him an anti-emetic such as Risperidone or Ondansetron for relief of vomiting.2. Also give sanitizing or Lansoprazole for associated gastritis.3. Offer him good, healthy homemade diet with plenty of oral rely 