Ayurveda, the science of life is in practice since the Vedic period. Rasashastra deals with mercury and other mineral drugs which are having high therapeutic value over the herbal drugs. Rasaushadhis (herbo-mineral preparations) are a treasure in Ayurveda therapeutics. The raw drugs generally possess lot of toxic impurities in its natural form and unwanted heterogenous qualities which are harmful for therapeutic use. To overcome these adverse effects of raw drugs and to make it suitable for therapeutic administration, the drugs are subjected initially to Shodhana process. Shodhana helps in removing all the impurities and potentiates its efficacy, which inturn reduces the side effects of the drug. The purified Rasaushadhis are either administered directly or may be subjected to further process like Marana, Satwapatana, Amrutikarana, Lohitikarana etc. The concept of Shodhana depends upon the structure of the drug, composition of the drug, impurities of the drug, qualities of the drug and actions of the drug. The changes in the raw material after purification are also established scientifically by modern analytical parameters.
Purification, Impurities, Shodhana, Rasa Dravya.
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