Medicinal plants have been used in the prevention, diagnosis, and elimination of diseases based on the practical experience of thousands of years. There is a pressing need to initiate and transform laboratory research into fruitful formulations leading to the development of newer products for the cure of diseases such as AIDS, cancer, and hepatitis, as well as coping with multi-drug resistance problems. This book presents recent developments in the research on medicinal plants for different diseases, formulation of products, and market strategy.