In the context of that quote, the dharma is the teachings of the Buddha. However, in another context it could mean something else because “dharma” is a word with many definitions. Ultimately it is all one in its essence. The Dharma is the Tao, the primordial oneness that weaves itself through all life. The Teachings arise from this and lead us to its realization, thus it is a form of medicine in the sense of restoring wholeness.