Despite the popularity of orally fast disintegrating tablets (FDTs), their formulation can sometimes be challenging, producing tablets with either poor mechanical properties or high disintegration times. The aim of this research was to enhance the properties of FDTs produced by direct compression to have both sufficient hardness to withstand manual handling, and rapid disintegration time. General multilevel factorial design was applied to optimise and evaluate main and interaction effects of independent variables i) disintegrant concentration, ii) % filler (Disintequick MCC–25) to mannitol on the responses hardness, tensile strength and disintegration time. In this experiment mannitol was used as a diluent, Disintequick MCC–25 (to best of our knowledge there is no publication available yet for its use with FDTs) was termed in this study as a filler and croscaremellose sodium was used as the superdisintegrant.