Formulation and Optimization of Porous Osmotic Pump based Controlled release System of Ritonavir for the Treatment of HIV Infection Sahoo Chinmaya Keshari1,*, Rao Surepalli Ram Mohan2, Sudhakar Muvvala3, Ramana D. Venkata4, Satyanarayana K.5 1Ph. D Scholar, Department of Pharmaceutics, Faculty of Pharmacy, University College of Technology, Osmania University, Hyderabad, Telangana-500007 2Professor, Mekelle Institute of Technology, Mekelle University, Mekelle, Ethiopia 3Professor and Principal, Department of pharmaceutics, Malla Reddy College of Pharmacy(Affiliated to Osmania University), Maisammaguda, secunderabad, Telangana-500014 4Professor, Department of pharmaceutical Technology, Netaji Institute of Pharmaceutical Sciences, Toopranpet, Yadadri Bhongir, Telangana-508252 5Professor and Principal, Department of pharmacognosy, Princeton College of Pharmacy, Korremula, Ghatkesar, R.R. District, Telangana-500088 *Corresponding Author E-mail: sahoo.chinmaya83@gmail.com
Online published on 2 June, 2018. Abstract The current research involves the development of controlled porosity osmotic pump (CPOP) tablets of ritonavir for the treatment of HIV infection. Core tablets were prepared by wet granulation method using hydroxyl propyl methyl cellulose (HPMCE5LV) polymer, mannitol as osmogen, MCC as diluents and other additives. The CPOP tablets were coated with cellulose acetate as wall forming material, poly ethylene glycol as flux regulating agent, and sorbitol acts as pore forming material in SPM. The prepared tablets were evaluated for FTIR, DSC, pre compression parameters, post compression parameters, in vitro drug release study and scanning electron microscopy study. The optimized formulation RM5 showed 94.83% at the end of 14 hrs with zero order drug release. The difference factor (f1) and similarity factor (f2) for RM5 were observed 14.61 and 75.12 respectively. Optimized formulation did not show any significant change on the pH and agitation intensity, but it depends on osmotic pressure of dissolution media indicated that mechanism of drug release was due to osmotic pressure. SEM micrographs confirmed that no pores were found before dissolution and after dissolution had shown the porous nature of the membrane. Short term stability study at 40±2ºC/75±5% RH for three months on the RM5 formulation indicated that there was no significant change weight variation, % friability, drug content and in vitro drug release. Top Keywords Ritonavir, wet granulation, CPOP, difference factor, in vitro drug release, stability study. Top |