Panax quinquefolium is usually taken as a decoction under a doctor’s supervision. Panlangen is mainly used to treat external fever, the first signs of warm disease, sore throat, warm toxin spots (warm and hot toxins invade the body resulting in skin spots, plaques), mumps, dengtoxin (acute infectious diseases, the skin can be seen as red like paint), vomiting blood, epistaxis, epidemic cerebrospinal meningitis, epidemic encephalitis B. It is not recommended to take if the body is weak but without solid fire and heat poison, and should be used with caution if the spleen and stomach are weak or cold. It should not be taken by those who are weak without actual fire and heat poisoning, and should be used with caution by those who have cold spleen and stomach. The adverse reactions of Banlangen are not clear, if used with other drugs may occur drug interactions, please consult your physician or pharmacist for details. If you need to use Banlangen, it must be used under the guidance of a professional doctor.