Arsh Kuthar Ras is an Ayurvedic medicine in tablet form.It is a Ras Aushadhi of Ayurveda.Mercury is known as Rasa in Ayurveda and medicines that are prepared using purified mercury, purified Sulphur, bhasma etc. are named as Ras aushadhi (Mercurial Preparations).
Para, Parad, Rasa or mercury is a heavy metal that remains liquid at room temperature. It is used in Ayurveda only after proper detoxification as per classical Ayurvedic texts. Parad is ingredient of numerous medicines due to its powerful medicinal properties. It balances Vata, Pitta and Kapha. Ras aushadhi (Parad containing medicine) are fast acting. They nourishes whole body and has tonic, aphrodisiac, rejuvenative, anti-aging, wound-healer, and antimicrobial effect. The combination of mercury with other medicinal ingredients enhances the therapeutic efficacy of medicine due to Yogvahi property of parad.
In preparation of Ras aushadhi/medicine first Kajjali is made from purified parad and gandhak. As these medicines contain heavy metals, it is better to take them as prescription drugs.