This is a staple in our medicine cabinet. So easy to use and works quickly. The only thing you have to be careful of is please, please, follow the instructions and do not use for more than a few days in a row. Last winter I used this for about a week, every night before bed. When I stopped using it my nose would automatically become stuffy the same time every night around the time I had been taking it on previous nights. I had to endure this for a few days until my system 'forgot' about it and then things went back to normal. Otherwise, it is a lifesaver with colds and flu.