The present invention relates to solid molecular dispersion of fesoterodine hydrogen fumarate and a polymeric binder. The invention also relates to an inert core bead or particle which is coated with said solid molecular dispersion and to pharmaceutical formulations comprising such coated beads or particles.本發明有關非索羅定反丁烯二酸氫鹽(fesoterodine hydrogen fumarate)及聚合黏合劑之固體分子分散液。本發明亦有關塗覆有該固體分子分散液之惰性核心珠或粒子,及關於包含此等經塗覆珠或粒子的藥學調和物。