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Stress testing is the main tool that is used to predict stability problems,6 l& l' _0 _( k! U% `# o- v
develop analytical methods, and identify degradation products/pathways.; X: g% P4 A0 a+ W( N. c" J
Since there are no detailed regulatory guidelines that direct how stress testing# k' I% h! P3 w1 o
is to be done, nor has there ever been a text/reference book on the9 C: T" D* S* _4 c# I
subject, stress testing has evolved into an artful science that is highly dependent
9 A; f( K4 R: s, r/ Hon the experience of the company or the individuals directing the studies. This: T8 @* L1 B4 z1 c: Y. ~/ h/ W
book provides readers with a single source reference that benchmarks the
e" u: _; D* }+ @6 \current best practices of experienced pharmaceutical scientists/researchers.
* ^" v0 I4 _) x' J; v* aQuestions like ‘‘How hot, how long, what conditions are appropriate?’’ and4 V7 g* x" P3 Z! }. }
topics such as mass balance, photostability, oxidative susceptibility, and the
: ~8 { K; Q7 B5 V- o) F+ W" t0 kchemistry of drug degradation are addressed in an objective, detailed scientific
/ U( h P4 Z5 {; }- Omanner, with ample references to relevant guidances and the scientific literature.& O) M/ F9 i" x. L
Compiling a book to be used as a scientific reference for the topic of- _4 Q: _' \9 r W. v' v( G0 r" ]
pharmaceutical stress testing was a daunting task. Stress testing, as it relates D2 ?. M% X& o7 o4 U5 a! x
to traditional small molecule pharmaceuticals, is very broad and scientifically+ x' W( N! m. i9 _# a: x9 W7 i
complex. Thus, this book seeks to be a practical and scientific guide
@3 o$ I) g% O+ f! O& [which will, hopefully, stimulate new ideas and further development of the
, F8 {' ^+ I5 M- K7 c- {# iscience.5 z9 d; f4 k, x6 v8 q
This undertaking is done with some trepidation, since I realize that discussion' c* a8 m( [. g" _) n( G7 ^+ `
of this topic could lead to attempts to formalize or standardize (i.e.,( k2 L* ~+ g; V7 }2 V( ]
regulatory standardization) an area of pharmaceutical science that relies on
3 h; f1 B. ~/ S- h! p* I! J- {) @scientific expertise and flexibility. Each new drug compound, formulation,+ P7 V: e; B) F# A
route of administration, delivery device, etc. has the potential to present/ ~( V2 ^# ]. S0 U) O- z( j
unique challenges and unanticipated problems, and should be approached& H' O6 S3 Q$ e5 R
with such a mindset. The pharmaceutical researcher must be free to design
' h/ p% d) T9 \' E- t( b; z) h9 eand develop new ways to predict and measure stability-related issues
/ p( @9 t) d2 r# d7 x% `0 fthrough stress testing. Nonetheless, it is hoped that this book will provide
$ ] }2 a3 N- X! G4 ha useful and practical scientific guide that is a welcome addition to the
- O7 q" Q$ y* _ k( ^, |library of many pharmaceutical scientists. I am confident that the ‘‘artful! w! u( ` n% Q* P* |
science’’ of stress testing will evolve beyond what is represented in this book
_4 ]. w0 F7 J8 g4 Bas other scientists further the science and fill in topics that are poorly covered
$ S2 }" q; [+ j7 a* Kor missing.7 O- E; f1 ?1 U* i9 v1 C- x
6 P' t0 u% ]/ O8 K8 `
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