The proper way to take Tongzhu is to take a decoction under the supervision of a doctor. Tongcao is the dried stem pith of Tongtuomu, a plant of the family Wugacaceae. It has the effects of diuretic and drenching (improving the problem of dribbling in urine and urinating in small amount), promoting circulation of Qi and lowering breast milk. It is mainly used for treating gonorrhea (increased urination and astringent pain), oedema, postpartum lactation and blindness. Tong Cao should be used with caution if there is deficiency of qi and yin and no internal dampness or heat. Pregnant women should be cautious of using Tong Cao. The adverse reactions and contraindications of Tong Cao are not clear, if used together with other drugs may occur drug interactions, please consult your physician or pharmacist for details. If you need to use Tongcao to treat diseases, must be used under professional medical supervision.