Zelan is a traditional Chinese medicine with the effects of activating blood circulation and regulating menstruation (regulating menstruation by activating blood circulation), removing blood stasis and eliminating carbuncles, and inducing diuresis and eliminating oedema (relieving urination and eliminating water retention), and can be used in the treatment of irregular menstruation, menstrual closure, dysmenorrhea, carbuncles, swollen toxins and oedema and ascites, etc. It has no clear side effects. Zeran is the dried above-ground part of the plant of the family Labiatae, which is bitter, pungent and mildly warm in nature, and has the efficacy of activating blood circulation and regulating menstruation, eliminating blood stasis and eliminating carbuncles, and inducing water retention and edema. It can be used for treating menstrual irregularities, menstrual occlusion, menstrual cramps, postpartum abdominal pain and carbuncles, swelling and toxins, and edema and ascites, etc. It has no clear side-effects. Although Zeran has no clear side effects, it is strong in activating blood circulation and removing blood stasis (promoting blood circulation and eliminating blood stasis in the body), so it should be used with caution for those who do not have blood stasis, and the specific use of Zeran should be guided by the physician’s diagnosis.