This collection of articles started about two years ago when the people at Russell Publishing contacted me to write a series or articles on excipients. (As some of you may be aware, I have worked with excipients more than a little over the years.) The question was the theme. At about the same time, the International Pharmaceutical Council of the Americas (IPEC-Americas) had started a working group on QbD. It seemed to me an appropriate theme. Thus was born the set of articles contained in this supplement to American Pharmaceutical Review.
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