Ivermectin is usually used to kill parasites in livestock. If it is poisoned, it is usually taken by mistake or used for suicide, and is mainly taken orally by oneself, and usually the first thing that violates the digestive system after oral intake is abdominal pain, diarrhea, nausea, vomiting and other symptoms. If vomiting and diarrhea are strong, dehydration, low sodium, low potassium, poor mental status and weakness of limbs may occur. After absorption through the gastrointestinal tract, the toxicity will invade all organs and tissues of the body through blood circulation. The first and most frequent symptoms are those of the nervous system, such as dizziness, headache, nausea, vomiting, lack of concentration, uncoordinated arms and legs, and in severe cases, coma, convulsions and shock. If it affects the respiratory system, it can lead to laryngeal edema or pulmonary edema, and you will have difficulty breathing, or it may irritate the bronchial tubes and cause an asthma attack.