The present book contains the simple, Rapid, Accurate and precise stability indicating method for the Selected some Antihypertensive and Antiparkinsonian drugs and formulations using high pressure liquid chromatography (HPLC).It contains the fundamental concepts to the Bio analytical chemistry along with the in depth knowledge of HPLC and Spectroscopic methods. The objective of this book was to provide the basic concepts of the analysis by HPLC to the pharmacy fraternity.