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Stress testing is the main tool that is used to predict stability problems,
2 z- s: @2 V: D, b& a9 Ndevelop analytical methods, and identify degradation products/pathways.% n% w2 ?$ A3 K* `
Since there are no detailed regulatory guidelines that direct how stress testing8 D9 V; d1 u' `! w, s) Y
is to be done, nor has there ever been a text/reference book on the$ d: V/ h* v' P4 Y
subject, stress testing has evolved into an artful science that is highly dependent. t7 r5 n+ H9 x4 p; Y
on the experience of the company or the individuals directing the studies. This& ^; G6 X' J8 r8 I7 `
book provides readers with a single source reference that benchmarks the
1 W1 s# g+ z+ b- u3 K# n' vcurrent best practices of experienced pharmaceutical scientists/researchers.; H& A: w9 D) N. i* s
Questions like ‘‘How hot, how long, what conditions are appropriate?’’ and
8 F( O/ W% t9 ltopics such as mass balance, photostability, oxidative susceptibility, and the5 U1 H2 ~6 s. {9 A- W
chemistry of drug degradation are addressed in an objective, detailed scientific
, f& \ T5 o+ z( W. d3 Amanner, with ample references to relevant guidances and the scientific literature.
+ j8 A% l- _8 GCompiling a book to be used as a scientific reference for the topic of
3 G6 e/ Z9 v D0 A* w: jpharmaceutical stress testing was a daunting task. Stress testing, as it relates
$ p) I6 R4 l, }! h0 ?to traditional small molecule pharmaceuticals, is very broad and scientifically- ^/ \( B7 w4 k( k
complex. Thus, this book seeks to be a practical and scientific guide) G) {) V. D, w+ ?# P
which will, hopefully, stimulate new ideas and further development of the
% G( o i+ A* L$ Bscience.
0 D2 _, p7 p5 v5 DThis undertaking is done with some trepidation, since I realize that discussion
$ x9 Z1 [; O" I- K. c8 uof this topic could lead to attempts to formalize or standardize (i.e.,6 K$ J- [( r" q8 \* j7 ]
regulatory standardization) an area of pharmaceutical science that relies on9 W1 {. C; G( x. |0 k+ t- |4 q2 h
scientific expertise and flexibility. Each new drug compound, formulation,' m6 ~1 O. \3 @, V6 `
route of administration, delivery device, etc. has the potential to present
! W& I% ^9 u: Nunique challenges and unanticipated problems, and should be approached
2 l. O! J' [# d& t# ]with such a mindset. The pharmaceutical researcher must be free to design# D* U# V; L4 s: c3 s$ R
and develop new ways to predict and measure stability-related issues2 `+ l+ ^0 ?# o1 c! Q9 R) U
through stress testing. Nonetheless, it is hoped that this book will provide
! K" G* ]) q7 @% Ka useful and practical scientific guide that is a welcome addition to the) o6 A, n% s3 \% @" b- [( z
library of many pharmaceutical scientists. I am confident that the ‘‘artful
' Y& n1 A3 @0 s7 d' Yscience’’ of stress testing will evolve beyond what is represented in this book3 K$ T) s) T6 U( z" X
as other scientists further the science and fill in topics that are poorly covered
8 g, H) I5 c( ?or missing.
5 ^2 ?- \' f) q9 Z' `% v. q N4 J% V0 E
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