The creation of new forms of drugs is one of the most important areas of development of the modern pharmaceutical industry. Orodispersible films have a number of advantages over conventional tablets and injections. Developing and scaling technology is time-consuming, resource-intensive, and expensive. The determination of critical parameters affecting the technology and quality of the finished product minimizes the risks of obtaining negative results during implementation and routine industrial production. The work presents the studies of the influence of excipients in the formulation on the characteristics of the dosage form and the technological process. The approach to development was considered from the standpoint of choosing a qualitative composition of the drug. The experiments were aimed at determining the most suitable viscosity of hydroxypropyl methylcellulose (HPMC), which makes up the matrix of the dosage form; optimal polymer- plasticizer ratios have been established. The studies carried out are basic in the creation of a transmucosal dosage form and orodispersible films and make it possible to optimize the process of developing the dosage form and reduce risks during the transfer of technology to production.