The effectiveness of the drug Frinosole in the complex treatment of early postoperative changes in the nasal mucosa after endonasal endoscopic surgery was studied. It has been confirmed that during surgical trauma of the mucous membrane of the nasal cavity, inhibition of the main functions of the respiratory epithelium occurs with a sharp increase in the absorption capacity of the mucous membrane of the nasal cavity. These changes correlate with the clinical picture of the early postoperative period. The data presented indicate a high efficacy of the drug in complex postoperative treatment and make it possible to recommend it for wider use in order to minimize the duration of the postoperative healing stages and prevent possible complications associated with excessive granulation and scarring of the nasal mucosa in the surgical areas.