The use of a medical therapeutic ozone agent in vivo to treat a variety of disorders including, but not limited to hypoxic conditions, autoimmune disease, fibrotic disease, inflammatory disease, neurodegenerative disease, infectious disease, lung disease, heart and vascular disease, metabolic disease, and cancer, wherein the therapeutic ozone agent is administered in a therapeutically effective amount, which can convert carbon monoxide to carbon dioxide, thereby treating or preventing the disease in a patient.