It is mainly used in clinical practice for children’s ascariasis. After oral administration of PTA, nausea, vomiting, abdominal pain, diarrhea, headache, abnormal sensation or hives may occasionally occur, which can disappear soon after stopping the drug. Allergic children may experience lacrimation, runny nose, cough, dizziness, drowsiness, and even asthma. In a few cases, they may develop viral hepatitis-like manifestations, pupillary constriction, and paralytic strabismus after oral administration of pagosan. This product is contraindicated in children who are allergic to pagosan, those with hepatic or renal insufficiency, neurological disorders or a history of epilepsy. Potential neuromuscular toxicity in humans, especially in children, should be avoided with prolonged or excessive use. Children with malnutrition or anemia should be corrected before starting this product. Immediate medical attention should be sought in the event of overdose or serious adverse reactions to Proteus. The use of this product with chlorpromazine may cause convulsions, so the combination should be avoided in clinical practice.