Abstract: Today, acute respiratory infections, including viral ones, occupy a leading place in the pathology of childhood. One of the frequent and severe manifestations of acute respiratory diseases in young children is acute (primary and recurrent) stenosing laryngotracheitis (ASLT). The problems of acute laryngotracheitis are caused not only by its high prevalence, the possibility of severe complications and death, but also by the tendency to recurrence. No less important is the features of the formation of both acute and recurrent laryngotracheitis. In the pathogenesis of acute stenosing laryngotracheitis (OSLT) in children, one of the leading clinical manifestations is the syndrome of endogenous intoxication. These are, first of all, destructive processes, as a result of which an excessive amount of intermediate and final metabolic products accumulate in the body, which have a toxic effect on the most important life support systems.