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The problem of finding new ways for pharmacological prophylaxis and treatment of respiratory tract diseases is very relevant in public health. To eliminate hypoxia, many European and American clinics use carboxytherapy as an additional or alternative treatment. Carbon dioxide administration eliminates the sequels of oxygen starvation, by producing artificial tissue hypercapnia, which causes an increase in oxygen delivery and carbon dioxide removal from the tissues and then from the body. The main mechanism of action of carboxytherapy is associated with enhanced tissue oxygenation and is due to the Verigo-Bohr effect: the effect of CO 2 concentration and pH on the binding of hemoglobin to oxygen and release of the latter from hemoglobin. By affecting the chemoreceptors of the respiratory center, carboxytherapy contributes to increased pulmonary ventilation and reduces bronchial smooth muscle tone and bronchial mucous secretion, as well as inflammation; all this improves breathing. By exerting a direct and reflex effect on the respiratory center, carboxytherapy induces hurried and deeper breathing, which increases pulmonary ventilation, speeds up perfusion and gas exchange in the lung, eliminates dyspnea and bronchospasm; therefore, it is widely used for lung diseases (asthma, pneumosclerosis, and silicosis). Carboxytherapy improves lung function in case of bronchopulmonary diseases, performance, and quality of life and it is used as an additional method in the pharmacotherapy of many diseases in pulmonology.

Carboxytherapy (the treatment based on carbon dioxide injections) is a multipurpose and widely used medical technology. The use of CO 2 injections (intracutaneous, subcutaneous, and pneumopuncture) have substantially supplemented and increased the practical relevance of carboxytherapy as a method for the treatment of many diseases. Thanks to it physiological properties, CO 2 has antihypoxic, antioxidant, vasodilatory, anti-inflammatory, analgesic, and spasmolytic activities; moreover, it improves blood viscosity, stimulates neoangiogenesis, and regenerative processes. Carbon dioxide is a sort of biochemical 'peacemaker' in tissue oxygenation: when blood cells are exposed to high CO 2 concentrations (Bohr effect), the rate of gas exchange (CO 2 and O 2 ) increases. The human organism interprets carboxytherapy (local hypercapnia) as oxygen deficiency and responses to it by boosting not only the blood flow, but also the vascular endothelial growth factor which stimulates neoangiogenesis and in the long run improves blood supply and tissue trophism. The multiple mechanisms of action, polymodal efficacy, a tool kit with a wide range of detectors and various modes of treatment make carboxytherapy a popular medical technology all over the world, namely in cosmetology, dermatology, aesthetic medicine, angiology, orthopaedics, cardiology, neurology, pulmonology, gynaecology, urology, proctology, plastic and general surgery, and other areas. Carboxytherapy provides a perfect example of the off-label usage in medicine that made it one of the most extensively applied medical technology for the treatment of various diseases despite the lack of the preclinical data and scarce relevant information available in textbooks, reference books and booklets.