Ayurveda, a medical system of world which is serving the ailing humanity, it is not only the system of treatment but also an ideal way of life and it is the repository of safe and therapeutically efficacious remedies. In Ayurvedic therapeutics, three categories of drugs are used viz - (1) Herbal product, (2) Animal products, (3) Metals including minerals, gems. Apart from their therapeutic efficiency in minute doses, Rasa Aushadhis were also found very effective for the preservation and promotion of positive health and prevention of diseases which is the primary aim of Ayurveda.
Rasa Shastra, the ancient alchemical science, or branch of Ayurveda originated with the twin aim of attaining Deha-Siddhi and Loha-Siddhi. But in the due course of time this science became more oriented towards Deha Siddhi and for therapeutic purpose. For curing obstinate and incurable diseases, minerals and mercury have been employed since Samhita period. But none of the ancient Acharya has mentioned its iatrogenic effects. This may be due to the fact that during that period, the purification and formulation of mercury was done under at most care and were administered with at most precaution.
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