Chenpi, the dried and mature peel of citrus fruits, has the effects of regulating qi, invigorating the spleen, drying dampness, and resolving phlegm. It can be used to treat symptoms such as stagnation of qi in the spleen and stomach, vomiting, and cough with excessive phlegm. Here are the specific details:
1. **Efficacy:**
   Chenpi is warm in nature and contains substances such as hesperidin, neohesperidin, nobiletin, tangeretin, and volatile oil. It has the effects of regulating qi, invigorating the spleen, drying dampness, and resolving phlegm.
2. **Functions:**
   1. **Treating spleen and stomach qi stagnation:** If a patient experiences symptoms such as abdominal distension and poor digestion due to spleen and stomach qi stagnation, chenpi can regulate qi and invigorate the spleen. Patients can take chenpi under the guidance of a doctor to treat this condition.
   2. **Treating vomiting:** Spleen deficiency and dysfunction may lead to decreased appetite and vomiting. Patients can take chenpi under the guidance of a doctor to invigorate the spleen and stimulate appetite, thus treating vomiting.
   3. **Treating cough with excessive phlegm:** The volatile oil in chenpi has expectorant effects. Therefore, patients can take chenpi under the guidance of a doctor to resolve phlegm and treat cough with excessive phlegm.