Pulsatile drug delivery

A Pulsatile drug delivery system delivers drug in rapid and burst manner within a short time after a lag time. There are many situations where drug is needed to be released immediately (after bursting the delaying film coat) at specific site. The aim of present work is to develop Pulsatile drug delivery of Tiotropium Bromide using press coating method. All the formulations have shown satisfactory results for various physicochemical parameters like hardness, friability, thickness, weight variation. Ethyl cellulose has predominant effect on the lag time, while also shows significant effect on drug release.  Press coated tablet shows a delayed release pattern. Among all the core tablet formulations T7 was selected based on drug release within a given period of time.  In-vitro release rate studies showed that the P3T7 was optimized based on less amount of drug release during lag time. Formulations P3T7 found to be stable at 45o C and 75% RH for a period of 6 months. FT-IR studies revealed that there was no interaction between Tiotropium bromide and the polymers. Keywords: Pulsatile drug delivery, circadian rhythms, Tiotropium Bromide, Lag time, Press coated tablets.

Aim of the present work was to formulate and evaluate an oral, time controlled drug delivery system to achieve timed release of Montelukast sodium, for the treatment of nocturnal asthma. An asthmatic attack mainly takes place early in the morning. Time controlled delivery system is capable of delivering drug when and where it is required most. Time-delayed tablets, designed to release drug after a predictable lag time, are intended for oral chronotherapy. A time dependant pulsed release system consisting of a core surrounded by coat layer of different ratios of swellable erodible hydrophilic layer HPMC K100M and rupturable hydrophobic layer Eudragit L 100 and Eudragit S 100 were prepared. These pulsatile tablets were evaluated for the drug content, thickness and in-vitro release profile, etc. and  two optimized formulation were selected and subjected to further studies. .