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Stress testing is the main tool that is used to predict stability problems,6 g w3 }* W, x
develop analytical methods, and identify degradation products/pathways.
9 j: G7 S- ^4 M0 qSince there are no detailed regulatory guidelines that direct how stress testing
& H$ `' h: y" K( I# @, _is to be done, nor has there ever been a text/reference book on the0 S0 E9 U' J: S. Q" W: \
subject, stress testing has evolved into an artful science that is highly dependent0 {& _. U* t! x5 h+ x V$ Q; b
on the experience of the company or the individuals directing the studies. This
0 ]6 g9 R: @1 y/ Q) g( ?book provides readers with a single source reference that benchmarks the
1 y5 O+ C8 W+ V' y3 pcurrent best practices of experienced pharmaceutical scientists/researchers.
; |$ C. u2 T- D, bQuestions like ‘‘How hot, how long, what conditions are appropriate?’’ and
2 x0 R& k3 ?1 ltopics such as mass balance, photostability, oxidative susceptibility, and the1 w! n9 {+ ]/ ~/ V8 F% v" S
chemistry of drug degradation are addressed in an objective, detailed scientific9 f( S3 n2 r) N8 K) D2 b" k
manner, with ample references to relevant guidances and the scientific literature.$ g" d0 a; @# M; J1 N8 i' ?+ x
Compiling a book to be used as a scientific reference for the topic of
( i8 {/ Z' H9 w1 }9 lpharmaceutical stress testing was a daunting task. Stress testing, as it relates
6 c8 f# C. t! G; A1 C/ @" r1 x, @to traditional small molecule pharmaceuticals, is very broad and scientifically
) E5 J* I2 j' K% b: t0 Rcomplex. Thus, this book seeks to be a practical and scientific guide) \# C& T6 M2 L9 \
which will, hopefully, stimulate new ideas and further development of the
9 x, W8 L0 L4 ]science.
# Q+ q$ X" _" G% J; x' {" aThis undertaking is done with some trepidation, since I realize that discussion
4 b) C1 J! r0 D( }4 J @% rof this topic could lead to attempts to formalize or standardize (i.e.,1 h7 L/ R9 H1 ^
regulatory standardization) an area of pharmaceutical science that relies on
/ {8 X3 H5 G7 `9 D4 z, B8 mscientific expertise and flexibility. Each new drug compound, formulation,
# p; _ u+ T. v) ~4 t, {. Q0 xroute of administration, delivery device, etc. has the potential to present/ x( N _) |' t
unique challenges and unanticipated problems, and should be approached
4 [( x. c$ E: M, ^3 o7 \, p7 Nwith such a mindset. The pharmaceutical researcher must be free to design5 C& ~0 u" ^- N! ~% ]! z/ L+ C
and develop new ways to predict and measure stability-related issues
4 K3 n3 B" I; W6 Pthrough stress testing. Nonetheless, it is hoped that this book will provide) L- C* x5 _, k) h1 b0 x
a useful and practical scientific guide that is a welcome addition to the
- n9 K4 s) s' ulibrary of many pharmaceutical scientists. I am confident that the ‘‘artful
! R, o0 L. G4 ?. a1 pscience’’ of stress testing will evolve beyond what is represented in this book* ?" o* D ^ }% \$ O. D2 b7 A0 M
as other scientists further the science and fill in topics that are poorly covered" d% E$ K" D+ F0 v. \, u& I
or missing.
" m" z- S) w' C: b
7 h# G" f9 a; n3 a7 l' v+ b |