Abstract: Apparatus for decomposing hard compressed tablets into powder includes a housing having a hopper for receiving the tablets therein and a discharge chute in the housing for discharaging the decomposed powdered tablets directly into a patient's cup. The housing is further provided with a cylindrical aperture therethrough which is adapted to receive an imperforate rotor in the cylindrical aperture. The imperforate rotor is provided with helical blades which protrude from said imperforate rotor means for decomposing said hard compressed tablets by a slicing and cutting action which controls the size of the powder by the height of the slicing blades.