Production of extended release mini-tablets using directly compressible grades of HPMC. - GreenMedInfo Summary
Production of extended release mini-tablets using directly compressible grades of HPMC.
Drug Dev Ind Pharm. 2012 Oct 19. Epub 2012 Oct 19. PMID: 23078551
School of Pharmacy&Biomolecular Sciences, Liverpool John Moores University , Liverpool , UK.
Context: Hypromellose (HPMC) has been previously used to control drug release from mini-tablets. However, owing to poor flow, production of mini-tablets containing high HPMC levels is challenging. Directly compressible (DC) HPMC grades have been developed by Dow Chemical Company. Objective: To compare the properties of HPMC DC (METHOCEL™ K4M and K100M) with regular (REG) HPMC grades. Method: Particle size distribution and flowability of HPMC REG and DC were evaluated. 3 mm mini-tablets, containing hydrocortisone or theophylline as model drugs and 40% w/w HPMC DC or REG were produced. Mini-tablets containing HPMC DC grades weremanufactured using a rotary press simulator at forces between 2-4 kN and speeds of 5, 10, 15 or 20 rpm. Mini-tablets containing HPMC REG were produced manually. Results and discussion: The improved flowability of HPMC DC grades, which have a narrower particle size distribution and larger particle sizes, meant that simulated large scale production of mini-tablets with good weight uniformity (CV 1.79-4.65%) was feasible. It was not possible to automatically manufacture mini-tablets containing HPMC REG due to the poor flowability of the formulations. Drug release from mini-tablets comprisingHPMC DC and REG were comparable. Mini-tablets containing HPMC DC illustrated a higher tensile strength compared to mini-tablets made with HPMC REG. Mini-tablets produced with HPMC DC at different compression speeds had similar drug release profiles. Conclusions: Production of extended release mini-tablets was successfully achieved when HPMC DC was used. Drug release rate was not influenced by the different HPMC DC grades (K4M or K100M) or production speed.