After taking POTUS, the intestinal parasites will usually be expelled after 1-2 days by means of bowel movements. However, the exact time of onset of action may vary for each patient due to their sensitivity to the drug. It is a broad-spectrum anthelmintic drug used to treat parasitic infections. It has a significant inhibitory and destructive effect on the entire developmental stage of parasites, especially for parasitic infections such as roundworms and hookworms. In addition, levamisole is a drug that is readily absorbed by the human gastrointestinal tract and metabolized in the liver, and can be recommended for infants and young children. In general, the effect of levamisole is usually seen within 1-2 days after administration, but some patients may experience a slight delay in the effect. It is recommended that patients should go to the gastroenterology department of the hospital for detailed examination before taking the medication to clarify the type of parasites and then take it under the guidance of the doctor. Then there is the need to pay attention to daily dietary hygiene and avoid eating contaminated food.