Vicks First Defence Cold Virus Blocker Nasal Spray 15ml 2 PackThis Bundle Contains: Vicks First Defence Cold Virus Blocker Nasal Spray Bottle 15ml x2 Why is it different from other cold products? What does it do? 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 the symptoms get worse.