It was the largest, most successful OTC allergy relief launch ever. In the first six months following its launch, Zyrtec OTC shook up prescription and OTC allergy medication markets in the U.S. with the OTC form of ZYRTEC almost completely eclipsing prescription allergy drug sales. A truly integrated campaign utilizing all media, digital, tv, print, and ambient media. "Spring Wonderland Dome" was an 8,100 square foot dome in Central park that brought spring (and thoughts of allergies) early to frozen New Yorkers, who were then plied with hot chocolate, free music and samples of newly OTC Zyrtec.