Aim: Prevention and treatment of upper respiratory tract infections are given the highest priority because of the tremendous health and economic impact of these diseases. Development of novel effective and safe options for treatment can contribute considerably to decrease the burden of disease.

Materials and methods: We designed a multicenter, randomized, double-blind, placebo-controlled study in ambulatory-treated adult patients with a clinical diagnosis of acute upper respiratory tract viral infection. The patients (18-60 years old) were randomized into two groups and followed-up for 5 days. Group 1 received the standard symptomatic therapy + Aviron Rapid®, and Group 2 received the standard symptomatic therapy + placebo. The primary endpoint of the study was defined as the duration of disease measured by the percentages of disease-free patients for every 12-hour period of the study. 

Results: Treating clinically relevant patients with the natural product Aviron Rapid® for 5 days decreases the duration of disease, the intake of antipyretics and the severity of symptoms. Significant difference between the tested groups for most of studied parameters was found as soon as 12 or 24 hours after initiation of administration in favour of active arm and was the most prominent on days 3 and 4. Significant decrease in the total score of symptoms severity was achieved on day 4 and extended to the end of study. There were no dif-ferences in the adverse events between the groups and the tested product demonstrated excellent safety profile. 

Conclusions: This study is a clinical confirmation of well documented antiviral activity of the product targeting multiple points in viral replication and covering broad spectrum viral pathogens.