What are the benefits and effects of five-finger citron?

Wuzhigan (Citrus medica) has the effects of soothing the liver, regulating qi, harmonizing the stomach, and resolving phlegm. It acts on the liver and stomach meridians and can be used to treat stagnation of qi in the liver and stomach, epigastric pain radiating to the ribs, and frequent belching. It may be used alone as a tea infusion or combined with Qingpi (Pericarpium Citri Reticulatae Viride) and Yanhusuo (Rhizoma Corydalis). Wuzhigan harmonizes the stomach and is indicated for rebellious stomach qi causing nausea and vomiting; in such cases, it can be combined with Sugeng (Herba Elsholtziae) and Jupi (Chenpi, Pericarpium Citri Reticulatae). The limonin contained in Wuzhigan not only induces bronchial contraction but also reduces the impact of histamine on the respiratory system, thereby resolving phlegm and relieving cough, making it effective for excessive phlegm, cough, and wheezing. Additionally, it is also used to treat hypochondriac pain due to hepatitis and dysentery with tenesmus.