The present invention relates to a fluidized bed based coating process for preparation of modified release multiparticulate systems. In particular, the fluidized bed based coating process relates to coating of multiparticulate system with a coating composition comprising poorly conducting and insulating material and amorphous hydrated silica having high water adsorption capacity and high porosity. By adding an amorphous hydrated silica having high water adsorption capacity and high porosity to the coating composition, it is possible to eliminate or reduce the accumulation of electrostatic charge generated in the fluidized bed during the process. Further, the process facilitates the manufacture of uniformly coated modified release multiparticulate systems which do not exhibit burst release.
