The effects of Psidium guajava include clearing heat and resolving phlegm, inducing qi and relaxing the chest, mainly for treating phlegm-heat coughs, chest congestion and dystocia (pain in the area of the ribs and chest). Psidium guajava is good at clearing the lungs and resolving phlegm (removing lung heat and dissolving phlegm), and can benefit the qi and broaden the chest, so it is commonly used for coughing and wheezing with lung heat and phlegm-salivation (abnormal phlegm and excessive production of saliva). It is often used in combination with burdock and Szechuan shellfish to treat heat shimmering in the lungs and gold, coughing and chest tightness, and body heat. It is often combined with almonds and rhubarb for the treatment of wheezing (shortness of breath) and restlessness, closed stools, and failure of lung qi to descend. For phlegm-heat congestion is not very general chest (chest and rib area collectively) pain, or stool is not solid and not suitable for the smoothness of piper betel, with piper betel is also effective, can be used alone or with Allium sativum, half-sia, phlegm-heat interlocks with the addition of Huanglian. Take piper betel bark need to pay attention to is, piper betel bark should not be taken with the aconite class of herbs, such as the grass crow, appendicia, Chuanwu, etc., will produce toxic adverse reactions. In addition to this, it should be used with caution for those with spleen deficiency and phlegm-dampness. The medication should be used under the guidance of a doctor, and self-medication is prohibited.