It is believed that due to the effect of this medicinal oil, Thotagamuwe Sri Rahula Thero had extraordinary memory powers throughout his life. In the local lore and legend it is also said that Thotagamuwe Sri Rahula Thera was an exorcist who had controlled demons by mantra to do manual labor work. According to the view of some historians and critics, the mortal remains kept in the Basilica of Bom Jesus in Goa, India, is the incorrupt body of Thotagamuwe Sri Rahula Thera, which was smuggled by the Portuguese from the remote village of Ambana in Southern Sri Lanka. It is believed that due to the effect of the Ayurvedic drug named "Siddalaoka Rasaya", which he had taken during the latter part of his life, his body will remain intact without decomposing until the year 4230 AD.