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Stress testing is the main tool that is used to predict stability problems,& K- D! i+ |$ [/ n4 b x
develop analytical methods, and identify degradation products/pathways./ |# `5 ^! v! O1 P- n
Since there are no detailed regulatory guidelines that direct how stress testing( p" J0 }0 q3 y" H0 ?, S( k- W
is to be done, nor has there ever been a text/reference book on the, }9 ?- w% u5 E$ c9 ]& Y$ S g
subject, stress testing has evolved into an artful science that is highly dependent1 X' C' p7 {* w0 E
on the experience of the company or the individuals directing the studies. This
1 L& Z5 O4 m) m3 v* \book provides readers with a single source reference that benchmarks the
; U N, L F I& }0 R5 Rcurrent best practices of experienced pharmaceutical scientists/researchers.+ m- a1 h" n6 l2 X& _
Questions like ‘‘How hot, how long, what conditions are appropriate?’’ and/ K0 l' x0 u0 k. \
topics such as mass balance, photostability, oxidative susceptibility, and the6 Z* e5 |4 ]2 i, v0 U
chemistry of drug degradation are addressed in an objective, detailed scientific
. U% m, X" Y ]3 H1 ~) Qmanner, with ample references to relevant guidances and the scientific literature.
- F8 M5 |6 i% nCompiling a book to be used as a scientific reference for the topic of
& `5 `* Y' n B( V& }- B: Ppharmaceutical stress testing was a daunting task. Stress testing, as it relates8 x2 { d# C4 D" I: ?/ M' R$ T9 z
to traditional small molecule pharmaceuticals, is very broad and scientifically
# Q! J" U+ z* V4 F% v, D0 Ccomplex. Thus, this book seeks to be a practical and scientific guide
& {3 n2 [+ K7 y' dwhich will, hopefully, stimulate new ideas and further development of the
/ X7 H1 f1 m1 ]3 Nscience.
$ c/ w% T$ L' P& i. `5 gThis undertaking is done with some trepidation, since I realize that discussion
+ c: l; _6 \+ m$ aof this topic could lead to attempts to formalize or standardize (i.e.,
" w( D* c$ s X( s+ J: Wregulatory standardization) an area of pharmaceutical science that relies on. Y( z9 _9 p5 w: g& U
scientific expertise and flexibility. Each new drug compound, formulation,
- ^' E) c1 A- Y& Mroute of administration, delivery device, etc. has the potential to present
& P% C& p4 W" B' f0 Bunique challenges and unanticipated problems, and should be approached
; t7 I& \8 s( n* Hwith such a mindset. The pharmaceutical researcher must be free to design
c6 a* W) R/ E/ B' k1 y' Yand develop new ways to predict and measure stability-related issues
3 T8 @& L& F; K) Y& j0 ithrough stress testing. Nonetheless, it is hoped that this book will provide
5 Z6 B* H# y7 C2 [' {2 Za useful and practical scientific guide that is a welcome addition to the
7 g9 |$ {3 O' v0 o7 A' s& hlibrary of many pharmaceutical scientists. I am confident that the ‘‘artful
* ~) F+ z+ d( d, c, J3 v+ `science’’ of stress testing will evolve beyond what is represented in this book# C) t, @: k& V( G: r/ K
as other scientists further the science and fill in topics that are poorly covered
6 I& M! [, U7 `( q/ p3 yor missing.
4 K: c) l% q2 M* D& H. f: J. F2 |" y$ J1 E3 r2 b" `7 U
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