Lianxiao is bitter in taste, slightly cold in nature, and belongs to the heart and small intestine meridians, and has the function of clearing heat and detoxifying the toxins, eliminating carbuncles and dispersing nodules. It can be used for the treatment of fever, headache, thirst, red tongue with little coating, etc. caused by external wind-heat or the beginning of warm diseases; it can also be used for the treatment of irritability caused by heat stagnation in the chest and diaphragm, as well as irritability and dizziness caused by heat entering the pericardium; it can also be used for the treatment of sores, swelling and pain caused by heat toxicity and scrofula and phlegm nuclei; it also has a diuretic effect and can treat short, red urine, dripping and astringent pain. Modern research has proved that forsythia has broad-spectrum antibacterial effects and can inhibit a variety of Gram-negative and positive bacteria, such as Staphylococcus aureus, Streptococcus pneumoniae, Streptococcus haemolyticus, Mycobacterium dysenteriae, Mycobacterium tuberculosis, Mycobacterium typhi, Vibrio cholerae, Mycobacterium diphtheriae and so on. Forsythia has anti-inflammatory, antipyretic, antiemetic, diuretic, anti-hepatic damage, and can strengthen the heart, improve myocardial contractility, and correct endotoxic shock.