Abstract

The aim of siddha medicine is to make the body perfect, imperishable and to promote longevity.  For the healthy life, Siddhars have mentioned daily and seasonal regimen including dietary habits and also insisted some code of ethics. Nowadays indhuppu has also been used in a kitchen culinary as salt, because of its anti-ulcer and slow laxative properties In siddha system of medicine, Indhuppu which is known as rock salt have been extensively used. Among thathu sarakkugal(mineral drugs), Indhuppu is considered as a major drug under 25 Karasam(twenty five types of therapeutic salts) and having perfect cubic cleavage. Rock salt occurs in crystalline massive and granular to compact form and is brittle mineral with a conchoidal fracture and vitreous luster. It is colourless when pure but often tinged gray, blue, and brown pink because of associated impurities. In this paper, organoleptic characters,  therapeutic characters, Geographical names of indhuppu, crystal natures, synthetic preparation, biological importance were discussed.