Those who learn the science of life with the view of gaining a knowledge in material medica, pharmacy, pharmacology and therapeutics have to study in the preliminary stage Nighantu books (Sort of eastern ancient dictionaries) which are composed of names and effects etc. of the Vegetable Kingdom, Mineral Kingdom and Animal Kingdom.  The earliest medical practitioners who were eager to gain a thorough idea in medical knowledge looked down these books as useful for gaining that end.  As grammar is essential to certain extent to become scholar, the nighantu is of same interest to become a physician.  Not only that, these people who were eager to better the future generations with the above knowledge compiled several books, they are: Rajanighantu, Dhanvantharinighantu, Madanapalanighantu, Kaiyadevanighantu, Nighantusara sangraha, nighanturathnakara, nighantuchandrodaya, Dravyaguna darpana and Dravya-guna Sangraha. Each and everyone of these books which are written in Sanskrit languae were both in India.  There are several Sanskrit nighantu books in other countries where eastern medical science was spread.  Among them both Saraswati nighantu and Siddhaushadha nighantu was compiled in Ceylon.  There is another nighantu named Wanawasa nighantu composed of Snighalese verses.  In other Sinhalese namavalu granthas and the nighantu named Abhidhanappadeepika which is composed of Pali Stanzas there are names and synonyms of subatances.  There are several Sanskrit books in India which can be ranked to those above.  This book is of great help to the students and practitioners of Ayurvedic medical science.  Though in comparing with the present we infer that this is incomposed in various things.