To clear the lungs, you can choose Andrographis paniculata, rehmannia and other medicines to make tea, but there is no such thing as “the best effect”. 1. The effect of Andrographis paniculata is to clear the lungs and detoxify the toxin, cool the blood and eliminate swelling (treat blood heat, eliminate swelling and pain). It can be used for symptoms such as lung-heat cough, sore throat, fever and dry throat. When using it, it should be noted that the adverse effects of the drug have not been clarified, but it is not suitable for people with deficiency of spleen and stomach (weak and cold spleen and stomach). 2. The efficacy of Rehmannia glutinosa is to clear the lungs and remove fire, and to produce fluids to quench thirst (promoting the production of fluids to relieve thirst). It can be used to treat symptoms such as heartburn and thirst, coughing, vomiting and hot drenching (burning and stinging pain evident during urination, accompanied by frequent and urgent urination, and discomfort from traction in the lower abdomen). It should be noted that rehmannia root is sweet and cold, so it is not recommended for people with weak spleen and stomach. Tea replacement drinks have limited efficacy, not a substitute for medication to treat the disease, if you are not feeling well, it is recommended to go to a regular hospital in time, under the diagnosis and treatment of a professional physician.