Development of solid dispersion systems of dapivirine to enhance its solubility.
Dapivirine, formerly known as TMC 120, is a poorly-water soluble anti-HIV drug, currently being developed as a vaginal microbicide. The clinical use of this drug has been limited due to its poor solubility. The aim of this study was to design solid dispersion systems of Dapivirine to improve its solubility. Solid dispersions were prepared by solvent and fusion methods. Dapivirine release from the solid dispersion system was determined by conducting in-vitro dissolution studies. The physicochemical characteristics of the drug and its formulation were studied using Differential Scanning Calorimetry (DSC), powder X-ray Diffraction (XRD), Fourier-transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). A significant improvement in drug dissolution rate was observed with the solid dispersion systems. XRD, SEM and DSC results indicated the transformation of pure Dapivirine which exists in crystalline form into an amorphous form in selected solid dispersion formulations. FTIR and HPLC analysis confirmed the absence of drug-excipient interactions. Solid dispersion systems can be used to improve the dissolution rate of Dapivirine. This improvement could be attributed to the reduction or absence of drug crystallinity, existence of drug particles in an amorphous form and improved wettability of the drug.
School of Pharmacy, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia.
Adinarayana
A
Gorajana
Chan Chiew
CC
Ying
Yeen
Y
Shuang
Pooi
P
Fong
Zhi
Z
Tan
Jyoti
J
Gupta
Meghna
M
Talekar
Manisha
M
Sharma
Sanjay
S
Garg
D019380:Anti-HIV Agents / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D008855:Microscopy, Electron, Scanning; D011092:Polyethylene Glycols / Q000737:chemistry; D011145:Polyvinyls / Q000737:chemistry; D033362:Powder Diffraction; D011743:Pyrimidines / Q000737:chemistry*; D011759:Pyrrolidines / Q000737:chemistry; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
D019380:Anti-HIV Agents; D011145:Polyvinyls; D011743:Pyrimidines; D011759:Pyrrolidines; C505150:poly(N-vinylpyrrolidine); D011092:Polyethylene Glycols; C481671:Dapivirine