Menthol is a saturated cyclic alcohol obtained from the oil of thin He. Also known as menthol, mint ice. Extracted from the leaves and stems of peppermint, white crystals, molecular formula C10H20O, for peppermint and peppermint essential oil in the main components. It can be used to produce a cooling sensation in the skin or mucous membranes to alleviate inappropriateness, the main pain. Menthol contains volatile oil 1 to 3%, the oil contains menthol (menthol) about 80%, followed by menthone, isomenthol, pinene and so on. The digestive tract has a stimulating effect on the medulla oblongata center and the heart has an inhibitory effect. Menthol 20 ml can cause serious poisoning. Poisoning manifestations: the onset of the disease occurs more than 10 minutes to several hours after eating. The manifestations are nausea, vomiting, abdominal pain, dizziness, numbness of hands and feet, unsteady gait, drowsiness, coma and so on. Some patients may experience laryngeal spasm, slow breathing, increased respiratory secretions, and decreased blood pressure. Allergic skin changes can occur. Therefore, it should not be taken for a long time Emergency treatment: Immediately maneuver or drug induced vomiting, after inducing vomiting, give the patient 50 grams of activated charcoal orally. Prohibit the consumption of milk and greasy food within 24 hours after poisoning. People with symptoms of poisoning should go to the hospital as soon as possible.