If you have diarrhea or vomiting again, you need to prohibit food intake and treat with levofloxacin, montelukast and, if necessary, oral rehydration solution. The main reason for having diarrhea and vomiting is the onset of acute gastroenteritis, which requires the cessation of food intake, as the intake of food at this time can lead to an increased burden on the gastrointestinal system, which is not conducive to the treatment of the condition. Many people are caused by bacterial infection of the gastrointestinal system, and for patients with bacterial infection, they need to be treated with levofloxacin medication. Levofloxacin can destroy bacteria and viruses in the digestive system while eliminating inflammation. After the inflammation in the gastrointestinal system subsides, nausea, vomiting and diarrhea can be improved. For people with more severe diarrhea, montelukast can be used appropriately. Montelukast can protect the gastrointestinal mucosa while inhibiting the toxins produced by bacteria and viruses, so it can achieve a rapid anti-diarrheal effect. Vomiting and diarrhea can lead to water loss in the body, so people with severe symptoms should also take oral rehydration salts to replace the water lost in the body to prevent dehydration.