The number of days to change the medication for anal fistula surgery needs to be decided in conjunction with the size of the anal fistula surgery trauma, which can be divided into low anal fistula surgery and high anal fistula surgery, as follows: 1, low anal fistula surgery: post-operative patients due to the small surgical trauma, the incision is also on the front, the general post-operative medication needs to be changed for 2-3 weeks, until the growth of the granulation in the incision is close to the skin level, there is no need to change the medication, but still need to return to the hospital regularly The first thing you need to do is to make sure that you don’t have to go back to the hospital to avoid excessive growth of the granules in the incision, which will affect the healing of the surgical incision; 2. The number of days to change the medication after anal fistula surgery is not fixed, but needs to be combined with the type of anal fistula itself, as well as the size of the surgical trauma.