Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The term “orphan drug” refers to pharmaceutical products developed for diagnosis, prevention or treatment of life-threatening conditions or debilitating rare diseases. They are called “orphan drug”, because the pharmaceutical industry has little interest in developing and marketing drugs which are designed for only a small number of patients affected by very rare conditions. However, the orphan drug market turned out to be an attractive opportunity for the pharmaceutical industry, according to a new report. Learn more about orphan drugs, by reading this book.