Matrix tablets are one of the main dosage forms that help to achieve sustainable release of drugs. In relationship with it this review contains a detail classification based on types of retardants used, porosity of matrix tablet and preferential mechanism of drug release viz., dissolution controlled, diffusion controlled and erosion controlled. Methods of matrix tablets have been incorporated covering wet granulation, dry granulation and sintering. Mathematical models of drug release from matrix systems have been presented. Various factors affecting release of drug related with polymer and drug itself are mentioned briefly.
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