1, Allium cepa is the dried bulb of Allium sativum or Allium sativum, family Liliaceae. It is pungent, bitter, warm, and enters the lungs, stomach, and large intestine meridians. Allium sativum has the function of dispersing knots, promoting qi and stagnation, activating blood circulation and removing blood stasis. It is used in the treatment of chest paralysis (similar to angina pectoris of coronary heart disease in modern medicine) caused by chest yang deficiency, which is characterized by stabbing pain in the chest, chest tightness and shortness of breath, and is often combined with gua-gua-gua-gua, gui zhi, half-summertime, citrus aurantium, descending incense, and chuanxiong rhizome. Thirdly, for the treatment of pain in the limbs caused by blood stasis, it is often used together with turmeric, safflower, cinnamon sticks and qiangwu.

2. Allium cepa is a qi-moving medicine, and should not be used in people with qi deficiency and no stagnation.