Mass Spectrometry in Drug Discovery summarizes the theory, instrumentation, techniques, and application of mass spectrometry and atmospheric pressure ionization to screening, evaluating, and improving the performance and quality of drug candidates. It provides time- and cost-efficient approaches for the generation and analysis of effective pharmaceuticals, covers advances in combinatorial chemistry, molecular biology, bioanalysis automation, and computing, and demonstrates the use of mass spectrometry in the assessment of disease states, drug targets, and potential drug agents.