Betadine Cold Defence Nasal Spray is a preventive solution designed to help protect against cold and flu viruses. This 20ml nasal spray creates a protective barrier in the nasal cavity to trap and help eliminate viruses before they can cause infection. The spray works by forming a micro-thin gel layer in the nasal cavity that helps trap and eliminate cold and flu viruses. It is drug-free and can be used at the first sign of cold symptoms or as a preventive measure when exposed to cold and flu viruses. The 20ml bottle comes with an easy-to-use spray applicator. As this is a medical product, please consult the package insert or your healthcare provider for complete usage instructions and safety information.