IRCT20190618043934N16 IRCT 2023-02-08 Birjand University of Medical Sciences The effect of Montelukast on the prevention of nasal polyp recurrence The Effect of Montelukast on Prevention of Nasal Polyps Recurrence Following Functional Endoscopic Sinus Surgery. 2023-01-21 anticipated 69 Complete https://irct.ir/trial/67850 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: The placement of people in each group will be randomized in a simple and blocked way, in one of the two groups A (receiver of Montelukast 10 mg tablets daily, one at night), intervention B (receiver of a topical steroid such as fluticasone 0.1 mg twice a day (50 micrograms each time) will be placed. In this way, first, various blocks of four are created on different cards (AABB, BBAA, ABAB, BABA, ABBA, BAAB). One of these blocks will be randomly selected and the patients will be divided into one of two groups A or B. Then randomization will be done for other patients as well, Blinding description: Outcome evaluator: The study administrator, without knowing the type of drug received, asks questions from the patients and records them in the relevant checklist. 3 Chronic rhinosinusitis. Intervention 1: Intervention group: The first intervention group: Group A received Montelukast tablets 10 mg daily, once at night for 6 weeks. Intervention 2: Intervention group: The second intervention group: group B receiving a topical steroid such as fluticasone 0.1 mg twice a day, 50 micrograms each time for 6 weeks. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is There is no need to publish individual patient information