The work was aim to design and characterize the sustained release mucoadhesive microspheres of Tolterodine
tartrate prepared by non-aqueous solvent evaporation technique using ethyl cellulose based selected mucoadhesive polymers.
Selected microspheres formulations of were found to be discrete, spherical and free flowing from the preliminary
formulations. The microspheres exhibit good mucoadhesive property in in-vitro wash off test and showed high drug entrapment
efficiency. Tolterodine tartrate release from these microspheres was slowed, extended and depended on the concentration
of ethyl cellulose and type of mucoadhesive polymer used. In vitro drug release studies suggested that formulation
F6c showed consistent drug release for up to 24 h time period. Among all the formulations, F6c containing ethyl cellulose
with chitosan showed the reproducible results with best mucoadhesive profile and good surface morphology. The
correlation value (r2) indicated that the drug release followed Higuchi model. Analysis of variance (ANOVA) showed significant
difference in the release of drug from all formulations at P < 0.05 level. Accelerated stability study of optimized
formulation (F6c) up to 3 month showed there was no change in drug content and release characteristics during storage.
Keywords: Sphericity, swelling index, in-vitro wash off test, in vitro drug release, mean dissolution time.
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