Bearing in mind the important role of oxidative stress and intensification of lipid peroxidation processes in the development and progression of obstructive pathology of the respiratory organs, we deemed it appropriate to evaluate the therapeutic effect of general baths containing biolong, an agent showing the antihypoxic and antioxidative properties. The clinical and functional studies that involved 109 patients (52 with chronic obstructive pulmonary disease (COPD) and 57 with bronchial asthma (BA)) have demonstrated the advantages of application of the hydrotherapeutic modality in the patients with bronchial asthma. The therapeutic effect was due to degradation of the allergic inflammation processes, the well apparent decrease in the activity of lipid peroxidation processes, the improvement of humoral immunity, generalized reduction of bronchial obstruction, enhanced physical working capacity, and psychoemotional adaptation.