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Kvātha is the filtered decotion obtained by boiling coarse powder of drug(s) in proportion of 4 and 8 times for mṛdu and madhyama dravyas respectuvely of water and reduced to one-fourth and 16 times of water for kaṭhina dravyas and reduced to one-eight.
- The Ayurvedic formulary of India Part III, page no 474.