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Stress testing is the main tool that is used to predict stability problems,
3 r5 d! c, g: ~, kdevelop analytical methods, and identify degradation products/pathways.; a# k4 _3 W) g9 ]9 r I
Since there are no detailed regulatory guidelines that direct how stress testing
( j# H1 t# ~! Nis to be done, nor has there ever been a text/reference book on the
1 L5 {$ v% {/ J8 |subject, stress testing has evolved into an artful science that is highly dependent% k6 [# V3 T/ b6 C
on the experience of the company or the individuals directing the studies. This) ]! v9 K8 ~. i. b' l0 }* E# i
book provides readers with a single source reference that benchmarks the
4 E( J9 _# j& V# G7 Icurrent best practices of experienced pharmaceutical scientists/researchers.9 w h. H9 X" C s6 v& ] E `: f
Questions like ‘‘How hot, how long, what conditions are appropriate?’’ and
7 a- {& H a% Y+ v. N! Ytopics such as mass balance, photostability, oxidative susceptibility, and the( e4 ?/ G3 G9 e7 G% {
chemistry of drug degradation are addressed in an objective, detailed scientific2 _2 L' H6 i2 P8 H+ b
manner, with ample references to relevant guidances and the scientific literature.9 U$ ]$ b) w+ _6 x' o! a
Compiling a book to be used as a scientific reference for the topic of b& X' ^( c. h. u6 E) I4 p' q
pharmaceutical stress testing was a daunting task. Stress testing, as it relates/ k0 ^5 \2 `! k4 ~7 |8 O
to traditional small molecule pharmaceuticals, is very broad and scientifically+ F+ G/ @ V% `0 V0 ~
complex. Thus, this book seeks to be a practical and scientific guide! u1 n1 r$ Y# A& c- B
which will, hopefully, stimulate new ideas and further development of the
. l% ?% f( X$ e u# x/ T# l( j' @6 ascience.
1 H( h) a/ Y) n/ i& N/ Z9 o/ @This undertaking is done with some trepidation, since I realize that discussion; t* H* S6 c2 d0 Z
of this topic could lead to attempts to formalize or standardize (i.e.,
5 C2 F% `; p2 M3 g, yregulatory standardization) an area of pharmaceutical science that relies on; Q6 q& V7 _, ?7 Y: a$ ^- U$ `
scientific expertise and flexibility. Each new drug compound, formulation,0 Z: I0 p" v. @) e( W! b9 l" [
route of administration, delivery device, etc. has the potential to present
K* c- F; X; d7 W) ounique challenges and unanticipated problems, and should be approached
; y2 \8 z, _: B1 S8 @# m+ ]with such a mindset. The pharmaceutical researcher must be free to design
1 z& D2 X# s7 }and develop new ways to predict and measure stability-related issues6 K8 z, g& ~5 L* R# N$ L$ O
through stress testing. Nonetheless, it is hoped that this book will provide
3 ?$ K: Z6 @% W, F$ _/ j; Ja useful and practical scientific guide that is a welcome addition to the
- ~) F$ i, F. m3 X9 \- }library of many pharmaceutical scientists. I am confident that the ‘‘artful5 O' r( _0 G1 K A0 E7 ^
science’’ of stress testing will evolve beyond what is represented in this book
: U! q3 \9 T; v. g- z7 oas other scientists further the science and fill in topics that are poorly covered
: P g$ S b( c& q5 Z8 Yor missing.
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- {, q; s; [2 h& e |