Benzydamine is used for pain relief. Benzydamine is a non-steroidal anti-inflammatory drug (NSAID). It works by blocking the release of certain chemical messengers that cause pain and inflammation (redness and swelling). Benzydamine is used to relieve pain and inflammation (redness and swelling) of mouth, gums, and throat. It is meant for mouth rinse or gargle only. Spit the rinse out after use, do not swallow it. It should generally be used undiluted. If it makes your mouth sting, you can dilute it with an equal volume of water before use. Avoid getting it in your eyes. If you accidentally get it in your eyes, rinse immediately with plenty of water. Do not use it for more than seven days, unless otherwise advised by your doctor.