Drugs with the main function of clearing heat are called heat-clearing drugs. Heat-clearing drugs are cold in nature, and have the effects of clearing heat and purging fire, drying dampness and cooling blood, detoxifying and clearing deficiency and heat. These drugs are mainly used for exogenous fever, hyperpyrexia and polydipsia, damp-heat diarrhea, erythema with warm toxin, carbuncle swelling and sore toxin, fever due to yin deficiency, etc. According to the different types of heat syndrome and the efficacy of drugs, heat-clearing drugs can be divided into five categories, namely, heat-clearing and purging gunpowder, heat-clearing and dampness-drying drugs, heat-clearing and detoxifying drugs, heat-clearing and blood-cooling drugs and heat-clearing drugs. These drugs are cold in nature, which is easy to damage the spleen and stomach. Those who eat less loose stool should use them with caution. Bitter and cold drugs are easy to cause dryness and damage yin, and patients with yin deficiency should also use them with caution; Yin deficiency and yang hyperactivity syndrome and true cold and heat are forbidden. Brucea javanica, a common heat-clearing drug. Houttuynia cordata Thunb. Guanzhong natural indigo leaves andrographis paniculata dandelion forsythia honeysuckle equisetum lotus root white-skinned Sophora flavescens Sichuan hibiscus bark Gentiana macrophylla root white-skinned cassia seed feldspar bitter bamboo leaves green box misty flowers Trichosanthes root white hair Prunella vulgaris yam gypsum granule essence Prunella vulgaris Gardenia bamboo leaves Huang Hu. Bupleuri Radix, Artemisia annua, Cortex Lycii, Radix Arnebiae, Radix Paeoniae Rubra, Radix Scrophulariae, Radix Pulsatillae, Herba Centipedae, and Flos Lonicerae. Yuzhou Rhamnus, Radix Sophorae Flavescentis, Rhizoma Paridis, Flos Chrysanthemi, Gynostemma pentaphyllum, Trollius chinensis, Caulis Sargentodoxae, Radix Isatidis, Radix Euphorbiae, Herba Hedyotidis Diffusae, and Cornu Bubali concentrated powder.