Om Namo Bhagavate Mahaasudarshanaaya Vaasudevaaya Dhanvantaraye | Amrita-kalasha Hastaaya Sarva Bhaya Vinaashaaya Sarva Roga Nivaaranaaya | Trilokapathaaya Trilokanaathaaya Shri Mahaa Vishnu Svarupa | Shri Dhanvantari Svarupa Shri Shri Shri Aushadha Chakra Naaraayanaaya Svaahaa
Meaning
Salutations to Lord Dhanvantari, the great wielder of Sudarshana, holder of the amrita-pot, destroyer of all fear and disease, path of the three worlds, Lord of the three worlds — embodiment of Maha Vishnu, the Narayana of the medicine-wheel.
Benefit
Maha Mantra of Dhanvantari — chanted on Dhanteras (Dhanvantari Trayodashi) and by Ayurvedic physicians before treatment. Said to potentise medicine.