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Effect of Different Types of Polymers as Well as Different Preparation Techniques on the In-Vitro Release of Dyphylline Controlled Release Matrix Tablets


 Dyphylline, xanthine derivatives, is used to manage asthma, cardiac dyspnea, chronic bronchitis, and emphysema. This work aimed to develop controlled release matrix tablets of Dyphylline using different types of polymers, and different preparation techniques such as direct compression, wet granulation, and hot melt methods. The prepared matrix tablets were evaluated by Infrared spectral analysis, differential thermal analysis, evaluation which included hardness, friability, content uniformity, and the in-vitro drug release. Kinetic analysis of the release profiles was investigated using different kinetic orders. All Dyphylline formulae obey Higuchi’s diffusion model. The diffusion is the mechanism of Dyphylline release from its controlled matrix tablets. IR and DSC revealed no incompatibility between Dyphylline and the polymers used in the prepared formulae. The obtained results revealed that the wet granulation technique using water as the granulating liquid is the best method for the formulation of Dyphylline hydrophilic matrix tablets compared with the other techniques. The high content of polymers led to the high value of T1/2, and a decrease in Dyphylline's extent due to the improvement of the retention of drug release. A synergistic effect was obtained using PVP-K-25 in the hydrophilic matrix tablets, which led to the retention of the drug release.