This medication is absolutely wonderful for the temporary relief of nasal congestion. When I get sick or have terrible allergies where I am extremely congested/cannot breathe, I use this product to help that problem. It relieves the congestion within minutes and I am able to breathe again. It is especially great for using at night. However, it should be used with extreme caution. The first time I used it during a terrible cold, I noticed after a few days that my nose would clog up immediately after about twelve hours and I had to use it again to clear out the congestion. It was an ongoing situation for another week after I was sick, before I realized that the spray was actually what was causing the congestion in my nose. Your body can become addicted to the spray and this product should be used very sparingly. If I use it now, I immediately stop using it as soon as I feel better. It usually takes a few days before my nose gets back to normal and does not act like it needs the product to be clear. If you keep this warning in mind, this product can really helpful during a cold or an allergy attack.