Nature has provided a complete storehouse of remedies to cure all ailment of mankind. The knowledge of drugs has accumulated over thousands of years as a result of man’s inquisitive nature so that today we possess many effective means of ensuring health-care. The history of herbal medicines is as old as human civilization. In the past, almost all the medicines were used from the plants, the plants being man’s only chemist for ages. Today, a vast store of knowledge concerning therapeutic properties of different plants has accumulated. Most of the medicinally active substances identified in the nineteenth and the twentieth century were used in the form of crude extract.