... this article as: Thorn et al.: Assessment of efficacy and impact on work productivity and attendance after a mandatory switch to generic second-generation antihistamines: results of a patient survey ... experiencesregarding efficacy, fatigue, and i mpact on work produc-tivity and attendance after a mandatory switch fromdesloratadine, ebastine, or fexofenadine to cetirizine orloratadine.MethodsBetween January ... whom a switch from desloratadine, ebastine,or fexofenadine to loratadine or cetirizine was man-dated. In addition, differences in efficacy and tolerabilityamong agents can only be determined...