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Stress testing is the main tool that is used to predict stability problems,# Q2 u/ c% W9 v4 _% }* w/ A! [* z
develop analytical methods, and identify degradation products/pathways.
. i0 O6 p' C6 @2 l2 DSince there are no detailed regulatory guidelines that direct how stress testing. b) f; Y7 Y+ H! J' V
is to be done, nor has there ever been a text/reference book on the) ]' L; Y5 K9 u' V0 ]/ n3 W
subject, stress testing has evolved into an artful science that is highly dependent
* ?+ i" w9 n+ e- v2 lon the experience of the company or the individuals directing the studies. This& g- c8 A) t& Q
book provides readers with a single source reference that benchmarks the8 M1 j% W, {& `7 E
current best practices of experienced pharmaceutical scientists/researchers.5 b- O- K3 B" s) p+ F0 E
Questions like ‘‘How hot, how long, what conditions are appropriate?’’ and* T& N# w" K# {3 L1 I
topics such as mass balance, photostability, oxidative susceptibility, and the
6 P$ X I3 ~7 G3 E& x' R hchemistry of drug degradation are addressed in an objective, detailed scientific4 e, H# V6 U+ P, j; W
manner, with ample references to relevant guidances and the scientific literature." D4 d( [, d4 E& _! O8 A' ~
Compiling a book to be used as a scientific reference for the topic of
: F. p2 ]0 [* I& p6 ~pharmaceutical stress testing was a daunting task. Stress testing, as it relates
3 u( {. `) [) D zto traditional small molecule pharmaceuticals, is very broad and scientifically5 }4 {4 N. x+ K, W; ^8 m% o
complex. Thus, this book seeks to be a practical and scientific guide! }6 W8 `& K0 j' E4 m
which will, hopefully, stimulate new ideas and further development of the
' j. x2 J6 N/ kscience.
$ C( C# h5 v6 X Q6 A3 cThis undertaking is done with some trepidation, since I realize that discussion# K8 I) L( [7 M' m9 M
of this topic could lead to attempts to formalize or standardize (i.e.,
* ?9 N+ g% n9 r9 S8 Kregulatory standardization) an area of pharmaceutical science that relies on0 s9 M7 o# C- p6 W# }5 i$ P
scientific expertise and flexibility. Each new drug compound, formulation,% q# f, m& C' b8 i9 Y3 o
route of administration, delivery device, etc. has the potential to present1 u* U3 z" H/ X$ s
unique challenges and unanticipated problems, and should be approached# ~2 D! P$ v+ O6 f% r3 I) y
with such a mindset. The pharmaceutical researcher must be free to design
7 q# O/ u7 D) }1 m [* W x" Cand develop new ways to predict and measure stability-related issues$ J% [" E2 w. w' h. Z% |5 k* m
through stress testing. Nonetheless, it is hoped that this book will provide
5 q# U* y/ W! z7 l+ H: Fa useful and practical scientific guide that is a welcome addition to the
3 M$ e0 O ]8 Z3 Hlibrary of many pharmaceutical scientists. I am confident that the ‘‘artful
2 {* d' I5 C8 a8 d3 s7 m7 x& r6 Sscience’’ of stress testing will evolve beyond what is represented in this book
- \" l: \7 u- Qas other scientists further the science and fill in topics that are poorly covered' P& I0 i H: N8 u6 f
or missing.
6 X9 y; d1 m8 m0 p9 {- Q+ }% q7 a( N7 n$ T$ D% |+ ~
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