XC-221

Primary objective of the study: evaluation of the effect of food intake on the bioavailability of XC221 100 mg tablets after a single oral administration in fed or fasted condition.
Additional objective of the study: evaluation of pharmacokinetic parameters, safety and tolerability of XC221 100 mg tablets in healthy volunteers after single oral administration in fed or fasted condition.

A multicenter, randomized, double-blind, placebo controlled comparative study to evaluate the safety, tolerability and efficacy of XC221 used at 100 mg daily and at 200 mg daily in patients with uncomplicated influenza or other acute viral upper respiratory infections (URIs) for 5 days of treatment.
The primary objective of the study is to evaluate the efficacy of ХС221 at 100 mg and at 200 mg in comparison with placebo regarding its effect on the severity and duration of influenza symptoms and symptoms of other viral URIs (fever and other major signs and symptoms).
The secondary objective of the study is to evaluate the safety of ХС221 at 100 mg and at 200 mg in comparison with placebo in the treatment of influenza ad other viral URIs.