Dravyaguna — Ayurvedic Pharmacology of Herbs
Dravyaguna (the properties and actions of medicinal substances) is the Ayurvedic system of pharmacology — assessing every herb, food, and medicine through five properties: taste, quality, potency, post-digestive effect, and special action.
Dravyaguna Shastra (the science of the properties and actions of substances) is one of the eight branches of Ayurveda and the foundation of its therapeutic pharmacology. Every medicinal substance is analyzed through five parameters: Rasa (taste — six primary tastes), Guna (quality — 20 pairs of opposing qualities, e.g., heavy/light, hot/cold, oily/dry), Virya (potency — primarily heating or cooling), Vipaka (post-digestive effect — sweet, sour, or pungent), and Prabhava (special action — specific therapeutic effects not explained by the first four, analogous to what modern pharmacology would call 'mechanisms of action beyond expected chemistry'). This framework allows Ayurvedic practitioners to predict the therapeutic effect of any herb or food on the doshas, Agni, Dhatus, and Srotas with high specificity. Modern phytochemical research has confirmed the therapeutic activities predicted by the Dravyaguna framework for hundreds of Ayurvedic herbs.
There is no substance in this world that cannot be used as medicine; the physician's skill is in recognizing the right substance for the right condition.
A 2019 comprehensive phytochemical analysis published in ACS Chemical Biology confirmed therapeutic activities for over 80% of the Ayurvedic herbs reviewed — including the specific anti-inflammatory, antimicrobial, antioxidant, and adaptogenic activities predicted by the classical Dravyaguna framework.
Charaka Samhita