Development and optimization of multiparticulate drug delivery system of alfuzosin hydrochloride.

The purpose of present research was to develop and optimize sustained release floating pellets of alfuzosin hydrochloride which has narrow absorption window in proximal intestine to improve patient compliance and therapeutic efficacy in the treatment of benign prostatic hyperplasia. The system was designed to provide drug loaded pellets coated with three successive coatings over Celphere(®) (microcrystalline cellulose pellets) - drug layer, effervescent layer (HPMC and sodium bicarbonate) and gas entrapped polymeric membrane (Kollicoat(®) SR 30D). A 3(2) factorial design was employed with HPMC:sodium bicarbonate and Kollicoat(®) SR 30D concentration as independent variables while drug release and floating lag time were the dependent variables.

Design and in vitro evaluation of multiparticulate floating drug delivery system of zolpidem tartarate.

Zolpidem tartarate is a non-benzodiazepine, sedative-hypnotic, which finds its major use in various types of insomnia. The present work relates to development of multiparticulate floating drug delivery system based on gas generation technique to prolong the gastric residence time and to increase the overall bioavailability. Modified release dosage form of zolpidem tartarate adapted to release over a predetermined time period, according to biphasic profile of dissolution, where the first phase is immediate release phase for inducing the sleep and the second phase is modified release phase for maintaining the sleep up to 10 h.

Chitosan microspheres as a delivery system for nasal insufflation.

The aim of the present study was to develop and characterize chitosan mucoadhesive microspheres for nasal delivery. The microspheres were prepared by emulsification-crosslinking method and evaluated for morphology, particle size, swelling index, in vitro mucoadhesion and delivery properties from Miat(®) nasal insufflator. The results showed that the microspheres were spherical in shape with smooth surfaces.