When used at the first signs of a cold, First Defence nasal spray acts at the back of the nose directly where the cold virus takes hold and starts to develop. It traps, inactivates and helps your body naturally remove the cold virus, before it develops into a full blown cold. Unlike medicines that help relieve bothersome cold symptoms, First defence nasal spray works at the first signs of a cold by targeting the viruses to help stop the cold in its tracks before they symptoms get worse. Apply 2-3 sprays per nostril immediately within the 14-36 hours after feeling the 1st signs of a cold such as a tickle at the back of your throat, or sneezing. Use up to 4 times a day. Avoid inhaling deeply. For best results continue to use for 2 days after symptoms subside. Not suitable for children under 12 years of age.