Medicine Buddha is an enlightened being who has unbiased compassion for all living beings. He comes from the eastern Pure Land called Lapis Jewel Land. This Buddha Land is the nature of wisdom with the aspect of lapis lazuli. The entire ground of that Pure Land is illuminated by this Buddha's light," and so on.
He protects living beings from physical and mental sickness and other dangers and obstacles, and helps them to eradicate the three poisons – attachment, hatred, and ignorance – which are the source of all sickness and danger. He is a Buddha Doctor.
The practice of Medicine Buddha, the Supreme Healer (or Sanjai Manla in Tibetan) is not only a very powerful method for healing and increasing healing powers both for oneself and others, but also for overcoming the inner sickness of attachment, hatred, and ignorance, thus to meditate on the Medicine Buddha can help decrease physical and mental illness and suffering and purification of negative karma.