Lama Zopa Rinpoche explains:
“The mantra of the healing enlightened being, TAYATA OM BEKANDZE BEKANDZE MAHA BEKANDZE RANDZE SAMUNGATE SOHA, bekandze means eliminating the pain, maha bekandze, great eliminating the pain. So, bekandze, one explanation, one commentary, one way of explaining the meaning, first bekandze, eliminating the pain, the true suffering, the whole entire problem, that contains the whole entire, not just disease but any problem, which is caused by action and disturbing thoughts. The second bekandze means eliminating the true cause of the suffering. So, that which is in the mind, that which is not outside, that which is the action and disturbing thoughts, the ignorance not knowing the ultimate nature of the I, and mind and so forth.”
“If you pray to Guru Medicine Buddha, you will quickly accomplish all that you wish. Just hearing the holy name of Guru Medicine Buddha and the sound of his mantra closes the door to rebirth in the suffering lower realms. It is written in the scriptures that you should not have a two-pointed mind (doubt) with regard to these benefits. …”
“Therefore, at the time of death, it is excellent to recite both Tathagata Medicine Buddha’s holy name and his mantra in the ear of the dying person. It is extremely beneficial to recite the mantra and blow it upon meat that you are eating, or even on old bones or the dead bodies of animals or humans. This action purifies the karmic obscurations of those sentient beings. It can cause someone who has been reborn in the suffering lower realms to immediately pass away and be reborn in a pure realm or amongst happy transmigrators. At the very least, it will shorten the duration of their suffering in the lower realms. It is excellent if this is done with bodhichitta, renouncing self and cherishing others."
“Also, by reciting this mantra, you will greatly enhance the power of the medicine that you are taking or giving to others. …”