Gua wilt skin should be Gua vulgaris skin. With the efficacy of clearing lung and resolving phlegm (removing lung heat and dissolving phlegm evils), broadening the chest and facilitating the dispersal of qi and knots, gua gua shao Pi can be used for treating lung-heat coughs, and pain in the chest and hypochondrium (a collective term for the chest and ribcage area) platitude (distension and discomfort in the stomach, etc.). Piper betel bark, also known as melon shell, raroon shell, is the skin of raroon, cold and sweet, belonging to the lung, stomach meridian. Gua Pou Pi is cold in nature and moist in texture, and has the effect of clearing the lungs and resolving phlegm, so it can be used for patients with phlegm-heavy coughs, yellow and sticky phlegm, and unfavorable coughing and spitting; it can clear the chest and lungs of stagnant heat, and dissolve the viscosity of turbid phlegm, and so it can pass the blockage of the chest and diaphragm, and treat pains in the chest. Note: Psidium guajava should not be used in combination with Chuanwu, Caowu, Radix Aconiti and Aconite. This medicine should not be taken by patients with deficiency of coldness in the spleen and stomach (spleen and stomach weak and cold), unformed stools, and phlegm-damp body. Adverse effects are not known. Patients are advised to seek prompt medical consultation if they feel unwell, and should not take the medicine on their own to avoid delay.