Intestinal wormer is a medication used to treat intestinal parasitic infections and also to prevent them. If it is determined that there are no parasitic infections in the body, there is no need to take oral wormer for treatment. On the one hand, it has no clear effect on the prevention of parasitic infections, and on the other hand, it may cause different degrees of side effects, such as dizziness, headache, nausea, vomiting, diarrhea, dry mouth, weakness, drug rash, exfoliative dermatitis, granulocytopenia, thrombocytopenia, etc. Although most of the symptoms can be relieved after stopping the drug, some people may have longer duration. It is recommended to develop good dietary hygiene habits and to wash hands before and after meals to reduce the chance of infection with intestinal parasites.