AAPS PharmSciTech

, Volume 19, Issue 5, pp 2311–2321 | Cite as

Solving the Delivery Problems of Triclabendazole Using Cyclodextrins

  • Daniel Real
  • Darío Leonardi
  • Robert O. WilliamsIII
  • Michael A. Repka
  • Claudio J. SalomonEmail author
Research Article


Triclabendazole is the first-line drug of choice to treat and control fasciolasis, a neglected parasitic human disease. It is a class II/IV compound according to the Biopharmaceutics Classification System. Thus, the aim of this study was to improve aqueous solubility and dissolution rate of triclabendazole complexed with 2-hydroxylpropyl-β-cyclodextrin (HP-β-CD) and methyl-β-cyclodextrin (Me-β-CD) at 1:1 and 1:2 M ratio. The impact of storage on the solubility, dissolution profile, and solid-state properties of such complexes was also investigated. Drug-carrier interactions were characterized by infrared spectroscopy, differential scanning calorimetry, X-ray diffractometry, and scanning electron microscopy. The solubility of triclabendazole improved up to 256- and 341-fold using HP-β-CD and Me-β-CD, respectively. In particular, the drug complexed with Me-β-CD showed a positive deviation from linearity, suggesting that its solubility increases with an increasing concentration of Me-β-CD concentration in a nonlinear manner. The drug dissolution was found to be improved through complex formation with HP-β-CD and Me-β-CD. In particular, the 1:2 M ratio complexes exhibited higher dissolution than the corresponding 1:1 M ratio complexes. The physicochemical characterization of the systems showed strong evidence of amorphous phases and/or of the formation of an inclusion complex. Stored at 25 °C, 60% RH for 24 months, drug complexed with β-cyclodextrins (CDs) at 1:2 M ratio remained amorphous. Based on these findings, it is postulated that the formation of triclabendazole-CD inclusion complexes produced significant enhancement in both the dissolution and solid-state properties of the drug, which may lead to the development of triclabendazole novel formulations with improved biopharmaceutical characteristics.


triclabendazole cylodextrin amorphous nature dissolution profiles storage 


Funding Information

DR, DL, and CJS gratefully acknowledge the Universidad Nacional de Rosario (Argentina) and CONICET (Argentina) for financial support. DR thanks CONICET (Argentina) for a Ph.D. fellowship.


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Copyright information

© American Association of Pharmaceutical Scientists 2018

Authors and Affiliations

  • Daniel Real
    • 1
  • Darío Leonardi
    • 1
    • 2
  • Robert O. WilliamsIII
    • 3
  • Michael A. Repka
    • 4
  • Claudio J. Salomon
    • 1
    • 2
    Email author
  1. 1.Instituto de Química de RosarioConsejo Nacional de Investigaciones Científicas y TecnológicasRosarioArgentina
  2. 2.Departamento Farmacia, Facultad de Cs. Bioquímicas y FarmacéuticasUniversidad Nacional de RosarioRosarioArgentina
  3. 3.Division of Molecular Pharmaceutics and Drug Delivery, College of PharmacyUniversity of Texas at AustinAustinUSA
  4. 4.Department of Pharmaceutics and Drug Delivery, School of PharmacyUniversity of MississippiOxfordUSA

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