Grey's appointment follows a change in legislation that allows the former prescription-only drug to be sold over the counter. Earlier this month, GSK launched a site at www.allergyanswers.info to offer advice on airborne allergies to support the brand.
The agency's first work for Flixonase is a TV ad to hit UK screens this week. It features people's heads made of things that cause allergies, such as grass, flowers, cats and dogs. Symptoms such as congestion and grogginess are listed.
After a product demonstration, the head made of flowers turns into a woman's head, which then changes into a shot of the product. The endline is 'Changing the face of allergy treatment'. Media is through MediaCom.
GSK roster agency Ogilvy & Mather previously handled Flixonase's ad account.
Grey, which also works on GSK brands such as Aquafresh, won the business after the two agencies were asked to produce work for the brand.