Abstract: The multi-function nasal cannula includes an elongate nasalgastric tube having at least one end configured to be connected to a source of therapeutic gas or fluid. A section of the tube includes a single nasal prong or barrel extending outwardly therefrom. A securing flap or extension is disposed adjacent to, but spaced from, the nasal prong. The securing flap is resilient and extends at an acute angle towards the nasal prong. The securing flap secures the nasal cannula against the side of the user's nostril when the nasal prong is inserted into the nasal opening. The resilience and flexibility of the securing flap insures a comfortable but secure fit, while minimizing any irritation or discomfort on the user. Alternatively, the multi-function nasal cannula may have double-barrels or prongs with corresponding securing flaps.