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A significant role in the pathogenesis of rhinosinusitis is played by an inflammatory reaction in the maxillary sinuses of the nasal cavity. Leukotrienes are the most powerful mediators of inflammation, especially at the early stages. The effect of combined dry extract BNO 1016 could be useful for the inhibition of the inflammation in rhinosinusitis. Thus, it appears reasonable to study the anti-inflammatory activity of the combined dry extract BNO 1016. Materials and methods The tested drug is the combined dry extract BNO 1016 produced by “Bionorica SE”. The reference drug is Ibuprofen. Leukotriene inflammation was induced by subplantar injection of zymozan into the right hind paw of male and female Wistar rats. Volumes of the resulting edema were measured and levels of anti-inflammatory activity together with mean effective dose (ED50) were calculated. Results The highest anti-inflammatory activity was observed at a dose level of 500 mg/kg of BNO 1016 during all time-points of the experiment and reached 65.2% 2 h after induction of inflammation. The anti-inflammatory activity of BNO 1016 at 500 mg/kg was credibly higher than that of Ibuprofen at all time-points of the experiment. Based on the data obtained from this leukotriene-dependent inflammation experiment the mean effective dose (ED50) for anti-inflammatory activity of dry combined extract BNO 1016 was calculated with help of Probit analysis. Conclusion The combined dry extract BNO 1016 shows a high level of anti-inflammatory activity in leukotriene-dependent inflammation which is very promising for the improvement of the treatment of patients. However, additional preclinical and clinical research on this drug should be carried out.

Study of the anti-inflammatory effect of the combined extract BNO 1016 in a leukotriene-dependent in vivo inflammation model