Yinhuang Granules and PuDiLan are two medicines that can’t be taken together, both of which are compound preparations of proprietary Chinese medicines. Among them, PuDiLan mainly contains Dandelion, Panax Quinquefolium, Bitter Dicotyledonin, Scutellariae Radix, which has the effect of clearing away heat and removing toxins, anti-inflammatory and reducing swellings, and it can be used for the swelling and pain in the throat caused by the infection of the upper respiratory tract, as well as for the symptoms of coughing and coughing up phlegm caused by bronchitis. Yinhuang Granules mainly contains honeysuckle, forsythia, scutellaria, and clove leaves, which also have the effect of clearing heat from the lungs, clearing heat and detoxifying toxins, and having the effect of relieving cough and dampness. The ingredients of the two drugs are very similar in action, if the two drugs are used together it will aggravate the effect of heat-clearing and detoxification, and may cause gastrointestinal discomforts, such as leading to coldness in the spleen and stomach, causing diarrhea, nausea and vomiting, so it is not recommended to take them together.