This document discusses the plant Digitalis purpurea, commonly known as foxglove. It contains cardiac glycosides such as digitoxin and digoxin. The leaves are harvested and dried below 60 degrees Celsius. Chemical tests can detect the presence of digitoxose, and the active constituents can be extracted and isolated using organic solvents and chromatography. The extracts and isolated compounds are estimated through colorimetric analysis and used commercially to treat conditions like heart failure and arrhythmias under brand names like Lanatoside C, Digitoxin, and Digoxin.