The phototherapy device "Doctor Light" is intended for the prevention and therapy of all types of respiratory and viral infections with monochromatic light of the visible spectrum of blue light, including COVID-19, incl. ARI, ARVI, laryngitis, rhinitis, tracheobronchitis, sinusitis, colds with symptoms of a runny nose, difficulty swallowing and fever, fungal infection of the oral mucosa, toothache, incl. and during their eruption, as well as heterogeneous forms of influenza in children from birth to four years old.