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Stress testing is the main tool that is used to predict stability problems,7 o( O2 }2 t# L m2 G
develop analytical methods, and identify degradation products/pathways.
1 C+ O6 d' x" M* n% h. vSince there are no detailed regulatory guidelines that direct how stress testing
! u! X Y5 i: s7 t8 [is to be done, nor has there ever been a text/reference book on the
- x0 Y8 l* V" `- e& K* _ K" _; ]& Bsubject, stress testing has evolved into an artful science that is highly dependent5 ~+ }* b8 e% q& P4 e0 W' F. ~
on the experience of the company or the individuals directing the studies. This
* p6 l: K6 ?% B( T9 h: Abook provides readers with a single source reference that benchmarks the) G7 t7 b+ k6 i. N3 v/ w
current best practices of experienced pharmaceutical scientists/researchers.
7 \5 u8 v `/ U1 M, }4 eQuestions like ‘‘How hot, how long, what conditions are appropriate?’’ and( b& `4 P, K4 D( ~+ _: m( v6 v
topics such as mass balance, photostability, oxidative susceptibility, and the
! ~; Z1 \& L5 i* echemistry of drug degradation are addressed in an objective, detailed scientific
: g; t4 J- U, y) M$ ]" h' X0 V! lmanner, with ample references to relevant guidances and the scientific literature.
" l8 F( x; U% A% WCompiling a book to be used as a scientific reference for the topic of
( c J% F% | Y2 P7 d P4 bpharmaceutical stress testing was a daunting task. Stress testing, as it relates
T3 w. Q8 r- u4 i5 M: g2 T, q/ @; \to traditional small molecule pharmaceuticals, is very broad and scientifically
- U3 g9 X, x9 X! @( l! P4 vcomplex. Thus, this book seeks to be a practical and scientific guide2 p7 k. \3 ]+ g! A
which will, hopefully, stimulate new ideas and further development of the3 B, ?% L0 f& h2 v# c
science.1 y6 W% F' b# l% x: D: M9 y) N
This undertaking is done with some trepidation, since I realize that discussion
" [5 w3 D0 N: S% x% K/ R% Nof this topic could lead to attempts to formalize or standardize (i.e.,
* Z- N0 j( N5 p, J; W" h& C/ F/ lregulatory standardization) an area of pharmaceutical science that relies on
5 W1 s2 E2 y4 z) R, P9 sscientific expertise and flexibility. Each new drug compound, formulation,
3 t a8 e8 v5 F# v( \# Droute of administration, delivery device, etc. has the potential to present
S! u7 @/ g8 n; Y. T5 S5 Runique challenges and unanticipated problems, and should be approached5 E m \- X7 M' i
with such a mindset. The pharmaceutical researcher must be free to design
`, d0 x) k6 t. o6 ~) G, y+ {3 Mand develop new ways to predict and measure stability-related issues
) v" g0 s# k, I- m7 C$ R# bthrough stress testing. Nonetheless, it is hoped that this book will provide# V/ I( j! j4 {
a useful and practical scientific guide that is a welcome addition to the
# ?" x. P& u$ E/ `library of many pharmaceutical scientists. I am confident that the ‘‘artful p' p3 I1 Z( B" c* H W! c
science’’ of stress testing will evolve beyond what is represented in this book# X4 M- C; N) L. c% N, _1 E. w5 J
as other scientists further the science and fill in topics that are poorly covered
2 c9 c5 N$ W5 N3 g0 Z e1 `9 _: Eor missing.
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