The article analyzes the expenditures of consumers for individual antiviral drugs during peak periods of seasonal infectious diseases. The reason for addressing this topic and its relevance lies in the fact that the volume of consumer spending on pharmaceutical products has certain trends that directly depend on a number of factors: the spread of infectious diseases, an increase in the level of advertising of a particular drug, an increase in the number of pharmacies in a particular network in residential areas and places of the greatest concentration of consumers, etc. However, in our opinion, the first factor is the most important when considering the dynamics of consumer expenditures for pharmaceutical products. In this regard, the most interesting is the dynamics of costs for the purchase of a particular group of drugs and the reasons for its increase.