absolutely harmful! Isatis indigotica is the root of Isatis indigotica in Cruciferae and Isatis indigotica in Acanthaceae. The function is to cool blood, detoxify, reduce swelling and stop bleeding. Indications are influenza, epidemic cerebrospinal meningitis, Japanese encephalitis, pneumonia, hepatitis, mumps, erysipelas, etc., with good effect. Banlangen is one of the commonly used drugs for colds. Some people think that Banlangen is an insurance drug, and there will be no adverse reactions after taking it. In fact, this understanding is incorrect. "It's a drug with three toxic components", and Radix Isatidis is no exception, and it also has certain toxic and side effects and adverse reactions. Therefore, you must keep in mind the following seven precautions when taking it: 1. Some people drink Radix Isatidis granules as tea to prevent colds, or use Radix Isatidis to treat colds, which is actually unscientific. Radix Isatidis can't prevent and treat all colds or infectious respiratory diseases, especially for cold-type colds, summer-heat and dampness-damaged exterior colds, qi-deficiency colds and yin-deficiency colds. 2, healthy people taking too much Banlangen will hurt the spleen and stomach. Long-term oral administration can cause loss of appetite, thin body, mental fatigue, salivation, diarrhea, abdominal pain, abdominal distension and so on. 3, people with deficiency of cold constitution, usually afraid of cold, spleen and stomach disharmony and easy diarrhea, and it is not appropriate to use Banlangen granules to prevent colds, otherwise it will lead to chills, stomach pain, loss of appetite and other symptoms. 4, children are weak, taking too much bitter and cold Radix Isatidis, Folium Isatidis, etc., will cause stomach gas damage, and never use adult doses, let alone long-term large doses. 5. Radix Isatidis can cause skin allergic reactions and adverse reactions of digestive and hematopoietic systems, most of which are caused by Radix Isatidis injection. Allergic reactions are mainly manifested as dizziness, chest tightness, shortness of breath, vomiting, cyanosis of face and lips, conjunctival congestion, swelling pain in both eyes, palpitation, irritability, numbness of limbs, flushing of the whole body skin, itching, rash or urticaria, sometimes manifested as erythema multiforme drug eruption, which can cause allergic shock in severe cases, including pallor, palpitation, sweating, irritability, shortness of breath, limb twitching and so on. Therefore, Radix Isatidis is not an insurance medicine, and it can't be taken indiscriminately and indiscriminately. If you have a history of allergies, you can't take it easily. 6. There are differences in the functions of the northern and southern Banlangen. Radix Isatidis has antibacterial, anti-inflammatory, immune enhancing, anticancer and detoxicating activities. It can clear away heat and toxic materials and cool blood. It can be used for treating epidemic febrile diseases, erysipelas, influenza, epidemic meningitis, influenza, mumps, Japanese encephalitis, infectious hepatitis, pharyngitis, sore and swelling. Radix Isatidis has antiviral, antibacterial, anti-endotoxin, antipyretic, anti-inflammatory, immune enhancement, anticancer, detoxification and monoamine oxidase inhibition activities. It can clear away heat and toxic materials, cool blood and relieve sore throat. It can be used for treating warm toxic spots, dark purple tongue, mumps, laryngitis, sore throat, erysipelas and carbuncle. Clinically, it is widely used to treat a variety of viral diseases, such as atypical pneumonia, Japanese encephalitis, influenza, mumps, acute hepatitis in children, herpes simplex keratitis, pharyngitis, verruca plana, pinkeye, dacryocystitis, chickenpox, herpes zoster and herpes simplex. 7, must according to the indications to symptomatic treatment, do not abuse and suffer from drug damage. The correct dose of influenza prevention for adults should be about 1 grams per day, with a course of treatment of 5-7 days, and the dose for children should be halved. If an allergic reaction occurs during medication, the drug should be stopped immediately. If there are chlorpheniramine, vitamin B6, prednisone and other drugs at home, you can take 2 tablets first and send them to the hospital immediately. If you have upper gastrointestinal bleeding, you should first fast for at least 24 hours and take it to the hospital as soon as possible. Hemolytic reaction has occurred, and it is the best policy to send it to the hospital immediately for treatment.