This book is focused on the principles and mechanisms of main drug degradation chemistry which are illustrated by representative examples reported in the literature. It will feature a collection of monographs for the degradation chemistry of 350 small molecule drugs. The 350 drugs are selected from a few sources such as the top 200 drug lists for the past few years, top selling prescription and OTC drug lists, WHO essential drug list and China's Basic Drug list. Each monograph is a concise summary of a drug's degradation chemistry and pathways reported in the literature with the author