A novel dosage form integrating solid dispersion (SD) in orally disintegrating tablets (ODTs) was developed and optimized by the face-centered central composite design to improve poorly soluble property and slow onset action time of felodipine (Fel). SD of Fel and hydroxypropyl methylcellulose E6 was prepared by solvent evaporation method. Differential scanning calorimetry and fourier transforms infrared spectroscopy indicated that Fel transformed from crystalline to amorphous state by the formation of hydrogen bond between –N–H in Fel and O–R in HPMC. The accelerated stability test in 45 °C, 75 % RH demonstrated that the optimized SD was stable in terms of the dissolution rate of Fel and thermodynamic property. The ODTs containing SD (Fel:HPMC E6 = 1:3) were prepared by direct compression technique. The face-centered central composite design with the ODT-SD was employed to investigate the effect of mannitol (X1), crospovidone XL (X2) on the ODT-SD disintegration time (Y1), % Fel released after 5 min (Y2) and the ODT-SD friability (Y3). ANOVA test showed that X2 and X2 * X2 had a significant effect on the ODT-SD disintegration time (p < 0.05). Meanwhile, the dissolution rate of Fel after 5 min did not remarkably depend on any independent variables (p > 0.05). The ODT-SD friability was substantially proportional to the amount of mannitol (X1) (p < 0.05). The optimized ODT-SD disintegration time, % Fel released after 5 min, and friability were 27.67 s, 88.35 and 0.48 %, respectively.
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This article does not contain any studies with human and animal subjects performed by any of the authors. All authors (N.-T. Tung, M.-V. Hung, X.-M. Vo, T.-H. Nguyen, T.-M.-H. Pham) declare that they have no conflict of interest. The authors are thankful to Department of Pharmaceutics, Hanoi University of Pharmacy for providing necessary facilities.
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Tung, NT., Hung, MV., Vo, XM. et al. Formulation optimization of orally disintegrating tablets containing solid dispersion of felodipine and hydroxypropyl methylcellulose using face-centered central composite design. Journal of Pharmaceutical Investigation 44, 111–118 (2014). https://doi.org/10.1007/s40005-013-0106-z
- Solid dispersion
- Orally disintegrating tablet
- Design of experiment