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Stress testing is the main tool that is used to predict stability problems,
, V; V! T/ ?1 I& o9 P: }' J8 bdevelop analytical methods, and identify degradation products/pathways.
! V0 X0 ]9 n; ?4 A6 g1 GSince there are no detailed regulatory guidelines that direct how stress testing4 _ l, \) C3 y" r: ^+ p, d; Z1 y
is to be done, nor has there ever been a text/reference book on the
t- T/ W& E% j ^; dsubject, stress testing has evolved into an artful science that is highly dependent7 `3 R( t* J6 G: j" Z
on the experience of the company or the individuals directing the studies. This
/ x, s& ~/ `! v$ G1 T8 w+ T. f3 Hbook provides readers with a single source reference that benchmarks the
/ F) h" Z n) mcurrent best practices of experienced pharmaceutical scientists/researchers.
5 Y2 _$ _, [2 X( O, ? gQuestions like ‘‘How hot, how long, what conditions are appropriate?’’ and% F7 C) y$ q0 K( W1 A
topics such as mass balance, photostability, oxidative susceptibility, and the
& H9 I k z6 B9 M5 p- m8 e% y. L: I) gchemistry of drug degradation are addressed in an objective, detailed scientific" E( y3 n8 n" M. S4 i* ~
manner, with ample references to relevant guidances and the scientific literature.4 G- ~" s% U- f
Compiling a book to be used as a scientific reference for the topic of; j* m# I" ~; S! R+ u$ v+ U0 }
pharmaceutical stress testing was a daunting task. Stress testing, as it relates( z, v, H+ a2 a8 p0 ^
to traditional small molecule pharmaceuticals, is very broad and scientifically; J# b& A0 }+ Y2 D$ D' b
complex. Thus, this book seeks to be a practical and scientific guide# F- t! z3 b9 T* n# A) H
which will, hopefully, stimulate new ideas and further development of the9 E5 P- |9 J8 ~4 [5 p# ]- _* O+ j
science.
/ |; l& B6 z, v1 H0 wThis undertaking is done with some trepidation, since I realize that discussion8 {5 f6 T2 y& G4 j; R
of this topic could lead to attempts to formalize or standardize (i.e.,
+ i3 z# ]+ a' x1 Z# vregulatory standardization) an area of pharmaceutical science that relies on
3 ?( `: ^* F# Q1 V0 a; yscientific expertise and flexibility. Each new drug compound, formulation,
' S& k0 P2 U+ y. J3 p" N) n. droute of administration, delivery device, etc. has the potential to present
$ F3 g# i7 N9 l, P5 ~& {+ {9 Xunique challenges and unanticipated problems, and should be approached- U) G9 m5 n. Z
with such a mindset. The pharmaceutical researcher must be free to design
9 c. A ^& N) N/ K& E. C' Vand develop new ways to predict and measure stability-related issues' o/ |: @1 s* t+ L
through stress testing. Nonetheless, it is hoped that this book will provide/ Y+ G0 k3 x/ o1 Y
a useful and practical scientific guide that is a welcome addition to the) j: @5 ~( c }# r0 F, |: K
library of many pharmaceutical scientists. I am confident that the ‘‘artful
e2 Q. P [% @! G* u' @1 Kscience’’ of stress testing will evolve beyond what is represented in this book' S6 L+ B& q g$ h- m4 Z3 q
as other scientists further the science and fill in topics that are poorly covered7 p2 o5 z1 i* U$ n' u0 O" B6 F
or missing.. U: n1 i4 a/ P1 L
: q1 @8 U3 R- j& v7 k
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