Relpivirine is a noble antiretroviral drug widely used now a days. Quality control of any molecule is very important & difficult task for an analyst. If the molecule is brand new, its adds up even more difficulties. Recently this drug has received USFDA approval, but as of now no single method is available to determine the Drug by using RP - HPLC instrument. This book is aiming to address that gap with vivid methodology, proper explanation, & description. An effort has been made to focus on the way of doing method development & validation according to official agencies ( ICH guideline) in maximum parameter along with all HPLC Chromatogram, Figures & Tables.Written in lucid manner, this book is must have for students, those who are pursuing Master & Bachelor degree in Pharmacy or Analytical Chemistry or any other related courses. Researchers in this field and even company personnel analysing this drug will find this book helpful. More over in this book a detail description of method development & HPLC Principle. Wish happy reading to all readers.