The issues of financing in a medical organization are one of the most relevant areas of healthcare in the Russian Federation. Providing departments with the necessary financial resources to provide effective and accessible medical care to the population is important for both the administration and doctors and nurses. In some regions of the Volga Federal District, the departments are combined (Penza, Saransk), that is, all types of medical care are provided to both adults and children in one place, which leads to a number of problems associated with the irrational use of medicines. One of these is the department of Maxillofacial Surgery of the N.N. Burdenko National Clinical Hospital, on the basis of which the disadvantages of using drugs for parenteral use are considered. The purpose of this work is an economic analysis of the effectiveness of the use of solutions for parenteral use in children on the basis of an adult medical organization. The materials of the study were data from patients ' medical histories, prescribing lists, invoices from the pharmacy organization, and data on the cost of medicines. The results of the work are an analysis of the existing problems of combined type departments related to drug provision, a number of medicines for parenteral use that are not available to order, but are included in the standards of treatment of children with injuries of the maxillofacial region. The ABC - analysis of expenses under the item "medicines" is calculated, the data of the VEN – analysis is presented, which includes vital, necessary and secondary medicines for the treatment of children with injuries of the maxillofacial region. An algorithm for the selection of effective and rational therapy has been developed, using the example of antibacterial agents for parenteral administration.