The clinic evaluation of the canadian pharmacologic agent "propolis" verified its value known from the literature in common cold infections. 50 persons were treated in ENT Clinic of Marcinkowski's Medical Academy in Poznań during the 1987 year. The observed therapeutic effects were shortening of the disease duration. The regression of symptoms occurred in the first day of the therapy and the complete recovery followed in 1 day in 5 patients, in 2 day in 16, and in 3 day in 3. The placebo group has his full recovery in mean 4.80 days. In the therapeutic group the symptoms lasted 2.5 time shorter than in placebo one.