formulation and in-vitro characterization of sustained release matrix type ocular timolol maleate mini-tablet

نویسندگان

seyed alireza mortazavi department of pharmaceutics, school of pharmacy, shahid beheshti university of medical sciences, tehran, iran.

yasaman ghadjahani pharmaceutical sciences branch islamic azad university, tehran, iran

hoda mahmoodi pharmaceutical sciences branch islamic azad university, tehran, iran

farzaneh mehtarpour pharmaceutical sciences branch islamic azad university, tehran, iran

چکیده

the purpose of this study was preparation and evaluation of sustained release matrix type ocular mini-tablets of timolol maleate, as a potential formulation for the treatment of glaucoma. following the initial studies on timolol maleate powder, it was formulated into ocular mini-tablets. the polymers investigated in this study included cellulose derivatives (hec, cmc, ec) and carbopol971p. mannitol was used as the solubilizing agent and magnesium stearate as the lubricant. mini-tablets were prepared by through mixing of the ingredients, followed by direct compression. all the prepared formulations were evaluated in terms of physicochemical tests, including uniformity of weight, thickness, crushing strength, friability and in-vitro drug release. four groups of formulations were prepared. the presence of different amounts of cellulose derivatives or carbopol 971p, alone, was studied in group a formulations. in group b formulations, the effect of adding carbopol 971p alongside different cellulose derivatives was investigated. group c formulations were made by including mannitol as the solubilizing agent, alongside carbopol 971p and a cellulose derivative. in group d formulations, mini-tablets were made using carbopol 971p, alongside two different cellulose derivative. the selected formulation (c1) contained ethyl cellulose, carbopol 971p, mannitol and magnesium stearate, which showed almost 100% drug release over 5 h. based on kinetic studies, this formulation was found to best fit the zero-order model of drug release. however, the higuchi and hixson -crowell models also showed a good fit. hence, overall formulation c1 was chosen as the best formulation.

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Formulation and In-vitro Characterization of Sustained Release Matrix Type Ocular Timolol Maleate Mini-Tablet

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Formulation and In-vitro Characterization of Sustained Release Matrix Type Ocular Timolol Maleate Mini-Tablet

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عنوان ژورنال:
iranian journal of pharmaceutical research

جلد ۱۳، شماره ۱، صفحات ۱۹-۲۷

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