Ketorolac Tromethiamine Tablets Targeting to Colon through Microbial Degradation and pH Dependence: Development and Roentogenographic Studies
The present experiment was designed to develop colon specific drug delivery system of ketorolac tromethiamine (KT) for treatment of various colonic disorders. Matrix tablets were prepared by direct compression technique utilizing combination of guar gum with various types of biodegradable/pH dependent/hydrophilic retarders. Tablets evaluated for quality control tests and in-vitro liberation studies (24h). In vivo roentogenographic studies and stability studies performed for optimized formulation. KT containing combination of guar gum with HPMCP (Hypromellose Phthalate) 55S released negligible amount in 1.2 pH and 7.4 phosphate buffers and 70% released in 6.8 pH (simulated colonic fluid) whereas 95% of KT released in 6.8 pH buffer (ratcaecal content). In-vivo roentogenographic studies of optimized formulation (F10) showed location of the tablet at 30 mins, 3 h and 8 h was in stomach, caecum and ascending colon respectively. FT-IR & DSC reveals that no interaction between drug and used excipients.
