After they have made medicine, Tibetan doctors use Medicine Buddha meditation and mantras to bless it. The medicine is then more effective because besides the power of all the medicinal plants and other substances it contains, it has additional spiritual power that can help bring a quick recovery and purification of the mind.
By reciting this mantra, we can increase the power of medicine that we are taking or giving to others. Place the medicine in a bowl in front of you and visualize a moon disc above it. Standing on the moon disc is a blue om surrounded by the syllables of the Medicine Buddha mantra in a clockwise direction. As you recite the mantra, nectars flow down from all the syllables and absorb into the medicine. The syllables and the moon then dissolve into the medicine, which becomes very powerful and able to cure all diseases and spirit harms, as well as their causes, negative karma and delusions. If you are treating someone with cancer, for example, imagine that the medicine has the specific power to cure cancer. The more faith you have and the more mantras you recite, the more power the medicine will have.