There is no Siddhi Sadhana or any other type of complicated Tantra prescribed for this Healing Mantra. Hence, according to me, the Mantra should be chanted just once with complete faith in Shri Ganesha, before consuming medicines or before going for any kind of medical tests or treatment, including surgery.
|Ganesha Rog Peeda Nivaran Mantra|
This is a Siddha and tested Ganesh Mantra and sincere Ganesh Bhakts have experienced the healing power of this Mantra. The only requirement is faith and it is faith, which can move mountains.
Note - The word देहि Dehi has been omitted by mistake in the English Version of the Mantra. kindly insert Dehi in the English Version, while chanting the Mantra.