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Stress testing is the main tool that is used to predict stability problems,
; }& W$ K: i6 i' C% Zdevelop analytical methods, and identify degradation products/pathways., `+ H; T. B' X
Since there are no detailed regulatory guidelines that direct how stress testing4 C+ {6 G6 l* [" r3 ~
is to be done, nor has there ever been a text/reference book on the
# W* W# q& \0 `1 O- M+ D4 T; Q. e' ysubject, stress testing has evolved into an artful science that is highly dependent/ N! R6 K. G- c2 r; k
on the experience of the company or the individuals directing the studies. This
- J5 Q9 O3 b+ d! cbook provides readers with a single source reference that benchmarks the: R# {$ O3 Y* w6 s/ x
current best practices of experienced pharmaceutical scientists/researchers.
/ R" r1 F1 ^& ?4 X0 @! [7 mQuestions like ‘‘How hot, how long, what conditions are appropriate?’’ and
' x$ \9 U1 K3 F, G0 G xtopics such as mass balance, photostability, oxidative susceptibility, and the% ?% T2 K$ ?# [/ w) V1 f
chemistry of drug degradation are addressed in an objective, detailed scientific
2 G: L! }; u9 Amanner, with ample references to relevant guidances and the scientific literature.6 T1 w$ j, o" ^. y' ^, e
Compiling a book to be used as a scientific reference for the topic of4 I: x% Z g. h |3 g+ h( `$ ~
pharmaceutical stress testing was a daunting task. Stress testing, as it relates
0 V0 D" {. u, _to traditional small molecule pharmaceuticals, is very broad and scientifically& G& s9 H9 c$ u1 j/ n; t
complex. Thus, this book seeks to be a practical and scientific guide
a( d% r1 R- z. Wwhich will, hopefully, stimulate new ideas and further development of the
3 D8 G0 f& U# ~3 S, X% O, m1 lscience.8 h1 J* _* H, i+ d5 [6 h
This undertaking is done with some trepidation, since I realize that discussion/ s; b' ]3 ~9 U* }
of this topic could lead to attempts to formalize or standardize (i.e.,
1 K o" T5 Q* Z* ?& S. gregulatory standardization) an area of pharmaceutical science that relies on
$ p A$ ~* \4 |" d4 _scientific expertise and flexibility. Each new drug compound, formulation,
b O0 \& H' ?, a# T7 |; S5 {route of administration, delivery device, etc. has the potential to present6 i4 z2 h4 V. E2 {- T* }4 W
unique challenges and unanticipated problems, and should be approached: s5 c* Q' V1 d) D2 b
with such a mindset. The pharmaceutical researcher must be free to design" z h) u1 y0 X: g* K; A: Z
and develop new ways to predict and measure stability-related issues" q3 u( M# J4 s8 b& H
through stress testing. Nonetheless, it is hoped that this book will provide
7 H5 W4 A) R: z( {a useful and practical scientific guide that is a welcome addition to the- y' f) a. J5 I* e8 B, e# N
library of many pharmaceutical scientists. I am confident that the ‘‘artful1 m4 S, a5 Q) \# y7 Q" z; q5 X9 l
science’’ of stress testing will evolve beyond what is represented in this book6 w, r" m" T' [3 z
as other scientists further the science and fill in topics that are poorly covered# c7 q& U' i" ]- } C2 P5 M' v7 X
or missing.
2 }0 h2 `8 }( _0 v/ K: B1 A) M6 l$ S4 a- Z
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