The present study was aimed to develop once daily extended release matrix tablets of minocycline hydrochloride, using hydroxypropylmethylcellulose either alone or in combination with ethyl cellulose as the matrix material in different proportions. The formulated tablets were also compared with a marketed product. The results of the dissolution study indicate that formulations FC-IV, FC-V and FC-VI showed maximum drug release upto 24 h, whereas the marketed product was found to extend the release only up to 14 h. Incase of formulations containing combination of hydroxypropylmethylcellulose and ethyl cellulose (FC-I to FC-IX), the release of the drug was found to be dependent on the relative proportions of hydroxypropylmethylcellulose and ethyl cellulose used in the tablet matrix. Mathematical treatment of the in vitro drug release data suggests that, all the formulations best fitted into first order release kinetics. Drug release from the matrix occurred by combination of two mechanisms, diffusion of drug from tablet matrix and erosion of tablet surface, which was reflected from Higuchi's model and Erosion plot.
The present investigation deals with development of mouth disintegrating tablets of rizatriptan benzoate to produce the intended benefits. Mouth disintegrating tablets of rizatriptan benzoate were prepared using superdisintegrants crospovidone, carboxymethylcellulose calcium, Indion 414 and Indion 234 using the direct compression method. The tablets prepared were evaluated for thickness, uniformity of weight, content uniformity, hardness, friability, wetting time, in vitro and in vivo disintegration time, mouth feel, in vitro drug release and assay by high performance liquid chromatography. The tablets disintegrated in vitro and in vivo within 4 to 7 s and 6 to 19 s, respectively. Almost 90% of drug was released from all formulations within 20 min. The drug release from the formulations followed first order kinetics. Stability studies of the tablets at 40±2°/75%±5% RH for 1 mo showed non significant drug loss. The formulation containing combination of crospovidone and Indion 234 was found to give the best results. Apart from fulfilling all official and other specifications, the tablets exhibited higher rate of release.
The objective of the present investigation was to formulate multiparticulate buoyant dosage form of nizatidine, a H2-receptor antagonist widely prescribed in gastric ulcers, duodenal ulcers. The short biological half-life (1 -2 hours), maximum absorption in initial part of small intestine, colonic metabolism of nizatidine favors, development of gastro retentive floating dosage form. Buoyant microspheres of nizatidine were prepared by spray drying technique using hydroxylpropyl methylcellulose and ethylcellulose as the rate controlling polymers. The prepared multiparticulate system were evaluated for various physicochemical parameters such as flow properties, in vitro buoyancy (floating lag time, total floating time), swelling studies, drug content and in vitro drug release. The shape and surface morphology of prepared microspheres were characterized by scanning electron microscopy. The formulated multiparticulate buoyant dosage form of nizatidine may be used in clinic for prolonged drug release in stomach for at least 12 hrs, thus improving the bioavailability of the drug during ulcer treatment.
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