The present book is a culmination of very honest and sincere efforts, keeping in view the level and aspiration of pharmacy students at the undergraduate level. The book includes simple language, neat and clean diagram, descriptive figures, flow charts, questions, multiple choice questions easy to understand by students All efforts have been made to make the book student friendly. This book is designed to impart basic knowledge on the chemical structure, storage conditions and medicinal uses of organic and inorganic chemical substances used as drugs and pharmaceuticals. It will discuss the following aspects of the chemical substances used as drugs and pharmaceuticals for various disease conditions. The chemical classification, chemical name, chemical structure, pharmacological uses, doses, stability and storage conditions of different types of formulations/dosage form available and their brand names. We have tried to make things simpler and easily understandable to our students, for whom this book has been written. Surely, our esteemed friends, while patronizing this book for their class room instruction, will also enjoy it. We honestly feel everyone will find the book refreshingly different and acceptable. Many valuable suggestions from esteemed colleagues and friends from various colleges have been given due weightage in the test.