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The article describes the approaches to classification and separation of groups of excipients in oral suspensions of both domestic and foreign authors. A number of existing classifications of excipients for oral suspensions are presented. The analysis of formulations of oral suspensions that are registered on the pharmaceutical market of Russia to assess the range of excipients the most relevant at the present time. Evaluations of the frequency of use of specific excipients are carried out and, if possible, the concentrations used.