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Stress testing is the main tool that is used to predict stability problems,
8 Q; }) c- {6 l+ E' a% e( y3 n# `5 Ddevelop analytical methods, and identify degradation products/pathways.
2 ~1 F& z" j$ g! A7 dSince there are no detailed regulatory guidelines that direct how stress testing
; X( G/ @- \2 Sis to be done, nor has there ever been a text/reference book on the$ c, s: _, U% M3 Q" P
subject, stress testing has evolved into an artful science that is highly dependent; u0 w* ^+ K- p. K, A; b
on the experience of the company or the individuals directing the studies. This
x# `) j/ l% Z# q- _6 l, s9 `book provides readers with a single source reference that benchmarks the6 E5 Q+ J8 _3 y
current best practices of experienced pharmaceutical scientists/researchers.; `2 `1 N5 e2 L& r" [
Questions like ‘‘How hot, how long, what conditions are appropriate?’’ and
5 `9 \! w1 v0 Y' ]/ Mtopics such as mass balance, photostability, oxidative susceptibility, and the
6 W& o/ U/ `# i4 g2 Achemistry of drug degradation are addressed in an objective, detailed scientific: U( }$ {' h4 a" A/ V
manner, with ample references to relevant guidances and the scientific literature.2 P7 f9 h r) \' \
Compiling a book to be used as a scientific reference for the topic of( _+ M v! R. x, [
pharmaceutical stress testing was a daunting task. Stress testing, as it relates4 W" C, \9 m1 { ]* v
to traditional small molecule pharmaceuticals, is very broad and scientifically
4 |% \( k6 N7 u8 B, Z- ?0 @+ \9 D, hcomplex. Thus, this book seeks to be a practical and scientific guide' l1 O% Y7 x( o, P& ]
which will, hopefully, stimulate new ideas and further development of the
3 k1 U5 N+ E9 Vscience.
; Q" N3 _; r3 v* ] EThis undertaking is done with some trepidation, since I realize that discussion; L8 e! N4 Q5 ~* L
of this topic could lead to attempts to formalize or standardize (i.e.,
3 L: E0 X m$ h5 z* a' j, kregulatory standardization) an area of pharmaceutical science that relies on {( }) l8 W' U9 C
scientific expertise and flexibility. Each new drug compound, formulation,
; a4 \' x. k* groute of administration, delivery device, etc. has the potential to present7 U, G; M# l* v
unique challenges and unanticipated problems, and should be approached
/ Z' \/ _, @, r7 ~; q5 \with such a mindset. The pharmaceutical researcher must be free to design9 |# z2 k( H* L6 }2 Z1 w J
and develop new ways to predict and measure stability-related issues
4 I8 F" K# A8 W k; T0 dthrough stress testing. Nonetheless, it is hoped that this book will provide
% l* g0 `& r( ?7 k) I" S$ ?+ z7 wa useful and practical scientific guide that is a welcome addition to the t0 [: v. ]$ k( W$ y
library of many pharmaceutical scientists. I am confident that the ‘‘artful# \ b3 X2 m* m" \8 c/ F
science’’ of stress testing will evolve beyond what is represented in this book! P' {$ u% ?/ o; ?- J
as other scientists further the science and fill in topics that are poorly covered) S% \/ m! x8 W% ^' ~6 N- ]0 F# ]
or missing.( _4 L- f; o5 i
+ K& k( E) B9 w! g3 }% n- Y' k' I |