Solubilization of poorly-water soluble drugs is most interesting field in pharmaceutical industry. Currently, up to 40% of new drug candidates have been discovered are water-insoluble drugs. Hence, they have low absorption and bioavailability. Solid dispersion, a popular technique that is currently gaining much attention from pharmaceutical scientists known to improve the solubility and dissolution rate of poorly water-soluble drugs. A number of key references that describe state-of-the-art technologies have been collected in this review, which addresses various pharmaceutical strategies for the solubilization of poorly water-soluble drugs using solid dispersion. Keywords: solid dispersion; poorly water-soluble drugs; dissolution. Key words: Solid dispersion; poorly water-soluble drugs; dissolution
Purposes: Aims of this study are dissolution enhancement of a poorly water-soluble drug by nano-sized solid dispersion and investigation of machenism of drug release from the solid dispersion. A drug for osteoporosis treatment was used as the model drug in the study. Methods: melting method was used to prepare the solid dispersion. Drug dissolution rate was investigated at pH 1.2 and pH 6.8. Drug crystallinity was studied using differential scanning calorimetric and powder X-ray diffraction. In addition, droplet size and contact angle of drug were determined to elucidate mechanism of drug release. Results: Drug dissolution from the solid dispersion was significantly increased at pH 1.2 and pH 6.8 as compared to pure drug. Drug crystallinity was changed to partially amorphous. Also dissolution enhancement of drug was due to the improved wettability. The droplet size of drug was in the scale of nano-size when solid dispersion was dispersed in dissolution media. Conclusions: nano-sized solid dispersion in this research was a successful preparation to enhance bioavailability of a poorly water-soluble drug by mechanisms of crystal changes, particle size reduction and increase of wet property.
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