Buccal patches, Sodium cromoglycate, Solvent casting


Objective: The purpose of this study was to design and formulate mucoadhesive buccal patches of sodium cromoglycate (SCG) as an alternative way to overcome its poor oral absorption and short half-life.

Methods: Mucoadhesive patches were prepared by solvent casting technique using cellulose acetate butyrate (CAB) alone or in combination with mucoadhesive polymers like SCMC (sodium carboxymethyl cellulose), HPMC 100M (hydroxyl propyl methyl cellulose) and Cbp934P (carbopol) in different concentrations. The successful patches were evaluated for thickness, weight variation, folding endurance, tensile strength, drug content, surface pH, moisture uptake, swelling percentage, mucoadhesion strength, residence time, in vitro release study, ex vivo permeation and in vivo pharmacokinetic studies.

Results: The thickness of all prepared patches ranged from 0.210±0.006 to0.355±0.012, folding endurance was more than 300, weight variation did not exceed 0.179±0.015, tensile strength and % elongation ranged from 6.4±0.018 to 13.1±0.024, and from 30.4±0.88 to 53.4±0.78respectively. The swelling percentage after one hour was from 20.8±0.99 to 53.2±1.5. pH of all prepared patches did not exceed 6.8, the drug content was about 99 to 101%, moisture uptake did not exceed 10%. Mucoadhesion strength and residence time ranged from 17.2±0.14 to 51.2±0.26, and from 3.35±0.25 to 7.45±0.28 respectively. The cumulative release percentage of SCG was in the following descending order CAB>CAB with Cbp934P>CAB with HPMC>CAB with SCMC. The optimized patch (F9) decreased the Cmax and increased Tmax compared to the parenteral solution.

Conclusion: It can be concluded that mucoadhesive buccal patch is a promising dosage form to prolong the release of SCG and enhance its poor oral bioavailability.


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