Acta Pharm. 57 (2007) 185-197

full paper

Original research paper

Development and in vitro evaluation of buccoadhesive carvedilol tablets

VAMSHI VISHNU YAMSANI^1,2, RAMESH GANNU¹_, CHANDRASEKHAR KOLLI¹, M. E. BHANOJI RAO² and MADHUSUDAN RAO YAMSANI^1*

ymrao123@yahoo.com

¹Center for Biopharmaceutics and Pharmacokinetics, University College of Pharmaceutical Sciences, Kakatiya University, Warangal-506 009, A.P. India

²Roland Institute of Pharmaceutical Sciences, Berhampur, Orissa, India

Accepted February 19, 2007

Buccoadhesive tablets of carvedilol were prepared using HPMC K4M, HPMC K15M and Carbopol 934 as mucoadhesive polymers. Fifteen formulations were developed with varying concentrations of polymers. Formulations of the BC or BD series were composed of HPMC K4M or HPMC K15M in ratios of 1:1 to 1:5 whereas in the BE series Carbopol 934 was used (1:0.25 to 1:1.50). The formulations were tested for in vitro drug release, in vitro bioadhesion, moisture absorption and in vitro drug permeation through porcine buccal mucosa. Formulation BC3 showed maximum release of the drug (88.7 ± 0.4%) with the Higuchi model release profile and permeated 21.5 ± 2.9% of the drug (flux 8.35 ± 0.291 µg h^-1cm^-2) permeation coefficient 1.34 ± 0.05 cm h^-1) through porcine buccal membrane. BC3 formulation showed 1.62 ± 0.15 N of peak detachment force and 0.24 ± 0.11 mJ of work of adhesion. FTIR results showed no evidence of interaction between the drug and polymers. XRD study revealed that the drug is in crystalline form in the polymer matrix. The results indicate that suitable bioadhesive buccal tablets with desired permeability could be prepared.

Keywords: buccal tablets, carvedilol, formulation, bioadhesion, evaluation