Our aim has been to provide the subject material in clear, simple, concise, and affable manner, which is beneficial to students and practitioners alike. We have updated the text according to the most recent literature and guidelines. Additional pictures and tables have been added to make the reading easier and more comfortable. Recently introduced newer drugs for various diseases such as hypertension, diabetes mellitus, HIV, blood cancers, hepatitis C, etc., have also been included. The 2020 has been the year of great predicament and challenges for humankind posed by pandemic. A section is dedicated to the management of COVID 19 as well.