The book "Chemical Aspect of the Metabolism of Medicinal Substances" is structured into three chapters and explores the effects of medicinal substances on the human body. It holds particular significance as it focuses on heterocyclic compounds and their functional derivatives, especially those widely used as physiologically active substances and medicinal preparations. To enhance comprehension, the book follows the traditional systematization for all classes of medicinal substances, covering definition and classification, nomenclature, methods of synthesis, structure and isomerism, physical and chemical properties, and key derivatives with notable biological activity. This approach ensures relevance for specialized disciplines. The three chapters are titled Metabolism of Medicinal Substances, Pharmacokinetic Interactions of Phytopreparations and Medicines, and Comparative Study on the Development of Pharmaceutical Forms Containing Anti-Tuberculosis Medicinal Substances.