After eating a bad stomach and vomiting, the stomach is difficult, usually considered to be caused by unclean diet, need to treat the cause and symptomatic treatment, such as oral levofloxacin, montelukast and probiotics. 1. Causal treatment: If bacterial infection is confirmed by routine blood and stool tests, levofloxacin tablets can be taken; if viral infection is confirmed, antiviral drugs such as entecavir can be taken orally. 2. Symptomatic treatment: if there is a significant increase in stool, it is necessary to take montelukast for antidiarrheal treatment, you can also take probiotics to regulate intestinal flora; for abdominal distension and diarrhea symptoms, it is recommended to take omeprazole acid suppression, teprenone capsule to protect the gastrointestinal tract mucosa; for diarrhea-induced dehydration symptoms, symptoms of dehydration, pay attention to the supplementation of water and electrolytes. Common adverse reactions to levofloxacin include nausea, vomiting, abdominal pain, diarrhea, and headache, etc.; levofloxacin allergy is prohibited; montelukast is common adverse reactions, including constipation, children need to follow the doctor’s instructions; bifidobacterium tetraprolium tablets common adverse reactions, including allergy, constipation, diarrhea, and gastrointestinal tract distention, etc., bifidobacterium tetraprolium tablets are contraindicated in allergic patients. In addition, there is a certain risk of taking the above drugs, patients need to get the guidance of a specialist, not blindly use their own medication.