IRCT2015041314483N4 IRCT 2016-03-21 Mazandaran University of Medical Sciences Phenytoin ointment in healing anal fistula after surgery Comparison between topical phenytoin 1% and placebo locally to reduce postoperative pain and recovery time for patients with perianal fistula after fistulotomy 2015-02-20 anticipated 44 Complete https://irct.ir/trial/14106 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment. N/A anal fistula. Intervention 1: All patients treated by probing fistula tract in lithotomy position under spinal anesthesia. Then direction is probe guided and fistulotomy done in its length and preserve sphincter muscles involved in CONTINENCY. then bed of wound currete to remove epithelial lining. Patients are hospitalized for a day. the Topical cream phenytoin 1% used to 2 times a day. for all patients prescribed an oral NSAIDS. Intervention 2: All patients treated by probing fistula tract in lithotomy position under spinal anesthesia. Then direction is probe guided and fistulotomy done in its length and preserve sphincter muscles involved in CONTINENCY. then bed of wound currete to remove epithelial lining. Patients are hospitalized for a day. the Topical placebo used to 2 times a day. for all patients prescribed an oral NSAIDS.