What are the side effects of Bu Zhong Yi Qi Wan?

As a traditional Chinese medicine (TCM) formulation, Buzhong Yiqi Wan is primarily used to tonify the spleen and stomach, augment Qi, and lift sunken Yang. However, prolonged use or inappropriate administration may lead to adverse effects, including allergic reactions, gastrointestinal discomfort, elevated blood pressure, “excess heat” (a TCM concept referring to symptoms of internal heat), and impairment of liver and kidney function. A detailed analysis follows:

1. Allergic Reactions

Some individuals may be allergic to certain ingredients in Buzhong Yiqi Wan, manifesting as pruritus, skin erythema, papules, or maculopapular rashes. In severe cases, life-threatening symptoms such as dyspnea may occur.

2. Gastrointestinal Discomfort

Some patients may experience gastrointestinal symptoms after taking Buzhong Yiqi Wan, including abdominal distension, anorexia, epigastric pain, bloating, diarrhea, or constipation—likely attributable to irritation of the gastrointestinal mucosa by certain herbal components.

3. Elevated Blood Pressure

Inappropriate dosing or use may result in increased blood pressure, posing risks to cardiovascular health. Patients with pre-existing hypertension should exercise particular caution when using this formula and monitor their blood pressure closely.

4. “Excess Heat” (Shanghuo)

Buzhong Yiqi Wan is classified as a warm-natured formula; long-term use may lead to excessive Yang accumulation in the body, resulting in “excess heat” symptoms such as dry mouth and throat, sore throat, oral ulcers, and dark yellow urine.

5. Hepatorenal Impairment

Prolonged or high-dose use may increase metabolic burden on the liver and kidneys, potentially leading to functional impairment. Patients with pre-existing hepatic or renal insufficiency should use this formula with extra caution and undergo regular monitoring of liver and kidney function.

If Buzhong Yiqi Wan is indicated, it should be administered strictly under the guidance of a qualified healthcare provider. Additionally, maintaining a light, balanced diet is recommended to optimize therapeutic efficacy.