There is no clear time for how many days you can take Tongcao at most, Tongcao has the effect of clearing heat and diuretic, and should be used in accordance with the doctor’s instructions. There is no pharmacokinetic study of Tongcao, the pharmacopoeia does not specify the specific duration of the course of treatment for Tongcao, so there is no clear provision on how long Tongcao can be taken. Tongcao is sweet, light, slightly cold in nature, belonging to the lung meridian, stomach meridian, with diuretic and clearing heat, the effect of qi under the breast, can be used to treat damp-heat gonorrhea (increased frequency of urination, gonorrhea and astringent pain), urinary edema, lactation and other conditions. Adverse effects of Tong Cao are not clear, pregnant women should use this product with caution. Tongcao should be used under the guidance of a physician to identify the evidence of the combination of drugs, not self-medication.