A review.Oral controlled release delivery systems are programmed to deliver the drug in predictable time frame that will increase the efficacy and minimize the adverse effects and increase the bioavailability of drugs.It is most widely utilized route of administration among all the routes that have been explored for systemic delivery of drugs via pharmaceutical products of different dosage form.Oral route is considered most natural, uncomplicated, convenient and safe due to its ease of administration, patient acceptance, and cost-effective manufacturing process.In order to overcome the drawbacks of conventional drug delivery systems, several tech. advancements have led to the development of controlled drug delivery system that could revolutionize method of medication and provide a number of therapeutic benefits.One of the most widely gastro retentive drug delivery system.The present paper highlights the current approaches and another aspects of the GRDS.