Does Lianhua Qingwen Capsule have a preventive effect against influenza B?

Lianhua Qingwen capsules can be used to treat mild influenza B, but they are generally not used for the prevention of influenza B. Lianhua Qingwen capsules are relatively effective in treating symptoms caused by influenza B associated with heat-toxin attacking the lungs, such as high fever, chills, muscle aches, nasal congestion, runny nose, cough, headache, dry throat, and sore throat. The main ingredients include Forsythia suspensa, Honeysuckle, processed Ephedra, stir-fried Bitter Apricot Seed, Gypsum, Isatis root, Houttuynia cordata, Patchouli, Rhubarb, Rhodiola, Menthol, and Licorice. This formula has the functions of clearing away epidemic toxins, relieving exterior symptoms, promoting lung function, and eliminating internal heat. It is quite effective in alleviating a range of symptoms caused by mild influenza.