Sri Nisargadatta Maharaj ( 1897-1981), one of the most important spiritual preceptors of the twentieth century, lived and taught in a small apartment in the slums of Bombay, India. A realized master of the Tantric Nath Lineage, Maharaj had a wife and four children. For many years, he supported himself and his family by selling cheap goods in a small booth on the streets outside his tenement. His life was a telling parable of the absolute non-duality of being. The profound yet simple words of this extraordinary teacher are designed to jolt us into awareness of our original nature. Like the Zen masters of Old, Nisargadattaês style is abrupt, provocative, and immensely profound cutting to the core and wasting little effort on the trigger shifts in consciousness, just by gearing, or even reading them. A study stream of Indians and Westerners, those fortunate enough to discover Maharaj during his lifetime, came to sit at his feet in the small loft where he received visitors. In the tradition of the sage Ramana Maharishi, he shared the highest Truth of non-duality in his own unique way, from the depths of his own realization. In this volume, Nisargadatta provides advanced instructions for spiritual aspirants. The Ultimate Medicine is not for those who like their spirituality watered down, but for serious students who will find herein powerful antidotes to unawareness.