The side effects of taking Tong Cao for breastfeeding are not yet clear. People with deficiency of both qi and yin (deficiency of both qi and yin) should be cautious in using this product, and please follow the doctor’s instructions for use of the medication. Tongcao is sweet, light, slightly cold in nature, and belongs to the lung and stomach meridians. It has the efficacy of promoting the flow of qi for breastfeeding, clearing heat and inducing diuresis, and is mainly used in conditions such as damp-heat gonorrhea (increased frequency of urination, drenching and astringent pain), breast milk not being able to get down, edema and urinary deficiency, and so on. Adverse effects are not clear, and it should be used with caution in people with deficiency of qi and yin, pregnant women, and people without dampness-heat. There is no authoritative information or literature that clearly indicates what side effects Tong Cao has when used for breastfeeding. In addition, the efficacy of a single medicine is limited, and cannot replace the therapeutic effect of multiple medicines used in combination, it is recommended to be used in combination, such as: postpartum breast milk is not accessible, often with pig’s trotters stewed in soup, or with Wang Buliuxing decoction, and so on. If you feel unwell and need to take medication, please go to the hospital and choose the appropriate medication under the guidance of the doctor.