Rengalin

The goal of this clinical trial is to evaluate the efficacy and safety of liquid dosage form of Rengalin in the treatment of cough in acute viral upper respiratory tract infections infections in children in during the epidemic growth of influenza and ARVI. The main questions it aims to answer are:
Investigators will compare the liquid dosage form of Rengalin to a placebo (a look-alike substance that contains no drug) to see if Rengalin in the liquid dosage form works for cough in acute viral upper respiratory tract infections in children.
Participants will:
Take the liquid dosage form of Rengalin or placebo per os 5 ml per administration 3 times a day for 7 days.