Start with high-confidence pharmacology books, then narrow by subgenre or adjacent topics.
Advances in Heterocyclic Chemistry
Alan R. Katritzky
Drug-like Properties
Li Di, Edward H Kerns
From Breakthrough to Blockbuster
Donald L. Drakeman, Lisa N. Drakeman
A Comprehensive Guide to Toxicology in Nonclinical Drug Development
Ali S. Faqi DVM PhD DABT ATS, Ali S. Faqi
Basic Principles of Drug Discovery and Development
Benjamin E. Blass, Benjamin Blass
Ten Drugs
Thomas Hager, Angelo Di Loreto
Pain Killer
Barry Meier
The Art of Writing Reasonable Organic Reaction Mechanisms
Robert B. Grossman
Mass Spectrometry
Jürgen H Gross