Last verified: April 2026
Ayurvedic herbs are never prescribed as raw plant material alone. The classical texts document twelve preparation types — each with a specific rationale for when and why that form is more effective than another. The form of the medicine is itself a therapeutic decision.
Sharangadhara Samhita, the primary classical text for Ayurvedic pharmacology, documents that the same herbs in different preparations produce different therapeutic effects. A powder (Churna) acts primarily in the digestive tract. A medicated ghee (Ghrita) carries active compounds into the deeper tissues. A fermented preparation (Arishta/Asava) is self-preserving and penetrates channels more rapidly. A calcined mineral (Bhasma) reaches tissues that plant preparations cannot access. The choice of preparation type is as clinically significant as the choice of herbs.
Dried herbs ground to a fine powder. The most direct form — acts primarily in the digestive tract and upper channels. Classical texts document specific mesh sizes and drying protocols. Most widely prescribed formulation type in classical practice.
Herbs boiled in water until the water reduces to one quarter (or one eighth for specific preparations). Water-soluble compounds extracted. Acts more rapidly than Churna. The classical preparation for acute conditions requiring fast action.
Herbs processed into clarified butter (ghee) through a specific classical cooking method. Fat-soluble compounds extracted. Ghee penetrates the deepest tissues — Majja (bone marrow) and Shukra (reproductive) — that water-based preparations cannot reach. The Rasayana preparation of choice.
Herbs processed into sesame, coconut, or other base oils. The primary form for external Abhyanga (massage) in Panchakarma. Internal Taila is documented for Vata conditions specifically — oil nourishes Vata's dry, rough qualities. Bala Taila and Dhanvantaram Taila are the most classically prescribed.
Herb powders bound with honey, jaggery, or herbal juice into tablet or pill form. Enables precise dosing, preservation, and portability. Classical texts document specific binding ratios and preparation methods. The primary modern commercial Ayurvedic form.
Semi-solid preparation of herbs in a jaggery or honey base. The form documented for Rasayana preparations requiring prolonged administration — the honey or jaggery base preserves active compounds. Chyawanprash (Amalaki-based) is the most documented classical Avaleha.
Herbal decoction fermented with jaggery, honey, and natural yeast for 30 days. Self-preserving (documented shelf life of years). Produces 5–12% alcohol as a natural byproduct that acts as the extraction medium and penetration enhancer. Documented as faster-acting than non-fermented decoctions.
Similar to Arishta but prepared from fresh herb juice rather than decoction. The distinction: Asava preserves more volatile and heat-sensitive compounds that the decoction process would destroy. Classical texts document Asava as more appropriate for herbs whose active principles are heat-labile.
Metals and minerals purified (Shodhana) and then incinerated through repeated heating cycles (Marana) to produce a nano-particle ash. Documented as reaching tissues inaccessible to plant preparations. Requires strict purification protocols. Lauha Bhasma (iron), Swarna Bhasma (gold), and Abhrak Bhasma (mica) are classical preparations documented for specific conditions.
Classical preparations involving purified mercury (Parada), sulphur, and other mineral compounds. The most potent and most strictly regulated classical preparations. Require extended purification protocols. Documented as the most bioavailable preparations — reaching all Srotas simultaneously. Requires specialised Rasa Shastra-trained practitioner.
Herb powders mixed with liquid (water, milk, oil) to form a paste for external application. Documented for skin conditions, wound management, joint conditions, and cosmetic applications. The classical texts document different base liquids for different conditions — water for Pitta conditions; oil for Vata; honey for infected wounds.
Medicated oils, ghee, or herbal preparations administered through the nasal passages. Classified as one of the five Panchakarma procedures. The classical rationale: the nose is the gateway to the brain (Shiras) — nasal administration directly accesses the Pranavaha Srotas governing the head and nervous system. Documented for ENT conditions, neurological conditions, and mental health.
While Charaka Samhita and Sushruta Samhita document specific formulations throughout their chapters, the systematic pharmacological classification of formulation types comes primarily from Sharangadhara Samhita (approximately 13th–14th century CE). Sharangadhara Samhita's Madhyama Khanda (middle section) provides the foundational text for: measurement units (Pramana), formulation types and their preparation methods, shelf-life documentation, and the clinical rationale for choosing each form. It remains the primary reference for the formulations section of the BAMS curriculum and the Ayurvedic Pharmacopoeia of India's compound formulation monographs.