Diosmin tablets are useful for anal fistula, but are generally used after anal fistula surgery to improve microcirculation. Diosmin tablets can improve blood and lymphatic circulation, and are generally used to treat acute attacks of hemorrhoids and venous and lymphatic insufficiency, such as leg pain, heaviness, morning soreness and discomfort. Its common adverse reactions include headache, dizziness, abdominal pain, diarrhea, dyspepsia, etc. Some patients may experience skin itching and allergic reactions. In addition, it is contraindicated for those who are allergic to this drug. Post-operative patients can take Diosmin tablets to improve microcirculation and post-operative edema, thereby reducing pain and promoting wound healing. Postoperative patients can also take antibiotics such as cephalosporin antibiotics, metronidazole drugs to prevent wound infection. Anal fistula patients should go to the hospital, under the guidance of specialists, according to the condition of the choice of appropriate treatment options, not to take their own medication, so as not to delay the condition.