Development and In vitro Evaluation of Sustained Release Matrix Tablets of Theophylline using Hydrophilic Polymer as Release Retardant

In the present investigation, an attempt has been made to increase therapeutic efficacy, reduce frequency of administration and improve patient compliance by developing sustained release matrix tablets of theophylline. Sustained release matrix tablets of theophylline were developed by using drug and different concentrations of polymer such as 10, 20, 30, 40 and 50%. Hydroxypropylmethylcellulose (HPMC) was used as a matrix material and microcrystalline cellulose as diluent. All the lubricated formulations were compressed using 10 mm flat faced punches. Compressed tablets were evaluated for uniformity of weight, drug content, friability, hardness, thickness, in vitro dissolution and swelling index. All the formulations were found to be within pharmacopoeial standards. Among the different formulations, F1 showed sustained release of drug for 12 h with 84.23% release. The effect of release modifier (PEG 6000) on in vitro drug release was also studied. Thus, HPMC can be used as an effective matrix former, to extend the release of theophylline.