The Ayurveda is not only science of life but also a spiritual science. The perfect health can be achieved by adapting and the proper understanding the pharmacology of the given drug. Acharya Priya Vrit Sharma Ji defined Dravyaguna Shastra as the branch which deals with Guna (Properties), Karma (Pharmacological Actions) and therapeutic effects of various Dravyas. The Dravyaguna is an Ayurvedic science which deals with drugs and their pharmacological actions. These pharmacological action is based on the fundamental principles of basic concepts of Dravya, Rasa, Guna, Virya, Vipaka, Prabhava, prime proto elements (Panchamahabhutas) and the phytochemicals present in the plants. In this book more than 260 Medicinal plants their chemical components have been dealt systematically. With blessings of all our Ayurvedic ancestors, scholars, here a small attempt is made to gather the information related to Dravya (Indian Medicinal Plants) that are scattered in various classical Ayurvedic texts so that one could easily understand the concepts and applied it in the clinical practice effectively. Hope this book will give a proper understanding the Indian medicinal plants, their chemical components and to be used as quick reference book. I request kindheartedly to all voracious readers, research scholars, students please consider this book and make good use of it.