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Here, solid dispersion (SD) techniques were utilized to improve the oral bioavailability of tadalafil (TDF). Poly(vinyl pyrrolidone-covinyl acetate) (PVP/VA S-630; 60% VP and 40% VA; MW 50,000) SD formulations were previously found to improve the solubility and dissolution (%) of TDF. The effect of various weak acids and bases on SD formulations was also investigated herein. PVP/VA S-630 SD formulations...
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