Lakshman et al. evaluated the use of the melt granulation (MG) process to enhance the tableting properties of poorly compactable high-dose drugs. Using Met as the model drug (88.2% w/w) and HPC as the polymeric excipient, the formulation was granulated by twin screw extruder and resulted in high compactibility and low friability [12].
Moisture-activated dry granulation (MADG) may be an interesting alternative which combines the benefits of high shear granulation while avoiding the issues of drying as found in the processes described above. This process was initially described by Ullah et al. in 1987 [29] and may be performed within a conventional high shear granulator, with pre-blending of all components intended for granulation and then a final blending prior to compression with further functional excipients, such as disintegrants or lubricants.