The function of forsythia flowers in water is not clear, forsythia is generally used in medicine with the fruit, has the effect of clearing heat and detoxification, etc. It can be used for the treatment of externally induced wind-heat, carbuncle (which is a kind of poisonous sores, occurring on the surface of the body, the limbs, the internal organs of the acute suppurative disease) and other diseases. Chinese medicine forsythia is the dried fruit of the plant forsythia of the family of Mulleinaceae, which has the efficacy of evacuating wind-heat, dispersing knots and subduing swellings, and clearing heat and removing toxins (clearing heat and poisonous evil from the body). It is often used in the treatment of wind-heat colds, fever, thirst and sore throat due to the initial onset of wind-heat, or heat into the camp blood (heat evil invasion of the human body to a deep degree, the symptoms are more serious) due to the fainting and spotting, high fever and thirst. Forsythia can also be used to treat sores and carbuncles, scrofula (mainly refers to the neck lymph nodes tuberculosis), phlegm nuclei (subcutaneous lumps swollen like nuclei), carbuncle pain and so on. The adverse effects of using forsythia are not clear, and it is not recommended for people with qi deficiency, sores and pus clearing, or those with spleen and stomach deficiency (spleen and stomach weakness and cold). Forsythia is usually taken by decoction, and its use in water is limited. If you feel unwell, you should consult a doctor in a timely manner and use the medicine under the guidance of a professional doctor.