Allium cepa needs to be taken under the guidance of a physician and is generally not recommended for long-term use. Allium cepa is a kind of traditional Chinese medicine, its flavor is pungent, bitter, warm in nature, with the efficacy of promoting yang and dispersing knots (warming yang qi, dissipating stagnation), moving qi and directing stagnation, it can be used for chest paralysis (stuffy pain in the chest) cardiac pain caused by the lack of vitality of the chest yang, cold, phlegm, dampness, stagnation, and it can be used in the treatment of the abdominal and stomach distension and discomfort caused by cold qi stagnation in the stomach and diarrhea and other symptoms of the disease treatment. The adverse reactions and contraindications of Allium cepa are not known, but patients with weak spleen and stomach, nausea (lack of appetite and reduced food intake) and those who cannot tolerate the taste of garlic need to use the drug with caution. Allium cepa belongs to the drug, should be under the guidance of a physician to use or discontinue medication, general disease recovery is not recommended for long-term use, if any discomfort, should also be timely and active medical treatment.