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The purpose of this study is to investigate the influence of cyclodextrins (CDs) and different acids on the solubility of fluconazole, and o formulate its more concentrated parenteral aqueous solution. Solubility studies of fluconazole with 7-CD, 2-hydroxypropyl-$\beta$-CD (HPCD), sulfobutyl ether $\beta$-CD (SBCD) and dimethyl-$\beta$-CD(DMCD) were performed. The aqueous solubility of fluconazole was measured in different concentrations of different acids with or without addition of CDs. Solubility of fluconazole increased in the rank order of $\beta$-CD<SBCD<HPCD<DMCD. HPCD and SBCD were chosen as solubilizers owing to their high solubilizing property and their low systemic toxicity. $^1$H-NMR studies confirmed the formation of an inclusion complex of fluconazole with HPCD. It was also shown by the NMR studies that the complex formed was a 1:1 complex. Among the different acids used, maleic acid and phosphoric acid increased solubility of fluconazole. The lower the pH of solution is, the more fluconazole dissolved, regardless of acids. Addition of HPCD (50 mM) to acid solutions increased the solubility about two times. New fluconazole injections at a dose of 10 mg/ml could be prepared in aqueous solutions containing 10% HPCD or 15% SBCD. These parenteral solutions did not form any precipitates at 4$^{\circ}C$ and was very stable at elevated temperatures. These results demonstrate that it is possible to develop a parenteral aqueous solution of fluconazole with a smaller injection volume using HPCD or SBCD.
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