Oral azithromycin after diarrhea if it is an adverse drug reaction, you can stop diarrhea symptomatic treatment or adjust the medication, if it is acute gastroenteritis should be anti-infective symptomatic treatment. 1. Adverse drug reactions: azithromycin common adverse reactions are nausea, vomiting, abdominal pain, diarrhea and so on. Therefore, diarrhea after taking azithromycin may be caused by adverse drug reactions. If the diarrhea is mild, you can take oral montelukast to stop diarrhea symptomatic treatment, if the diarrhea is serious, azithromycin should be discontinued, replaced with other drugs, diarrhea dehydration should be actively rehydrated. 2. Acute gastroenteritis: diarrhea may also be caused by diseases, such as acute gastroenteritis, can be manifested as diarrhea, abdominal pain, vomiting and other symptoms. If the bacterial infection should be actively given sensitive antibiotics such as cephalosporin treatment, if the viral infection, mainly symptomatic treatment, such as oral montelukast to stop diarrhea, probiotics to regulate the intestinal tract, rehydration and so on. Diarrhea should be early to see a doctor, under the guidance of the doctor to determine the cause of the disease, targeted treatment, drugs should be used in accordance with the doctor’s instructions.