The ear is also known as the ear, "Compendium of Materia Medica," said the stem and leaves smell bitter and cold, there is a small poison, avoid pork, horse meat, rice slop. Therefore, the two should not be eaten together. In addition, Cang Er contains rhamnoside, this component has a toxic effect, and its stems and leaves contain substances toxic to neuromuscular, the poisoned person will appear general weakness, dizziness, vomiting, nausea, abdominal pain, respiratory distress, irritability, slow pulse, and other symptoms, severe jaundice, coma, or extensive hemorrhage, and even life-threatening.