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Design and Development of Repaglinide Microemulsion Gel for Transdermal Delivery

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Abstract

Microemulsion formulation of repaglinide, a BCS class II hypoglycemic agent with limited oral bioavailability, was developed considering its solubility in various oils, surfactants, and cosurfactants. The pseudo-ternary phase diagrams for microemulsion regions were constructed by water titration method at K m 1:1 and characterized for optical birefringence, percentage transmittance, pH, refractive index, globule size, zeta potential, viscosity, drug content, and thermodynamic stability. To enhance the drug permeation and residence time, the optimized microemulsions having mean globule size of 36.15 ± 9.89 nm was gelled with xanthan gum. The developed microemulsion-based gel was characterized for globule size, zeta potential, pH, and drug content. All evaluation parameters upon gelling were found to be satisfactory. Ex vivo permeability study across rat skin demonstrated higher steady-state flux (P < 0.05) for microemulsion of repaglinide in comparison to the repaglinide microemulsion gel. At the end of 24 h, the cumulative drug permeation from microemulsion and microemulsion gel was found to be 229.19 ± 24.34 and 180.84 ± 17.40 μg/cm2, respectively. The microemulsion formulation showed 12.30-fold increase in flux as compared to drug suspension with highest enhancement ratio (E r ) of 12.36. Whereas microemulsion gel exhibited 10.97-fold increase in flux (with highest E r , 11.78) as compared to repaglinide (RPG) suspension. In vivo efficacy study was performed in normal Sprague-Dawley rats by using oral glucose tolerance test. Results of RPG transdermal microemulsion gel demonstrated remarkable advantage over orally administered RPG by reducing the glucose level in controlled manner. Hence, it could be a new, alternative dosage form for effective therapy of type 2 diabetes mellitus.

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Acknowledgements

Authors are thankful to the University of Mumbai for partially funding the present work. Authors acknowledge Dr. Reddy’s Laboratory, Hyderabad, for providing the gift sample of repaglinide. Authors also wish to extend their thanks to Gattefosse–India Pvt. Ltd.; BASF, Germany; Stepan Company, USA; and Signet Chemicals, India, for providing the gift samples of various excipients.

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Correspondence to Ujwala A. Shinde.

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Shinde, U.A., Modani, S.H. & Singh, K.H. Design and Development of Repaglinide Microemulsion Gel for Transdermal Delivery. AAPS PharmSciTech 19, 315–325 (2018). https://doi.org/10.1208/s12249-017-0811-4

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  • DOI: https://doi.org/10.1208/s12249-017-0811-4

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