Charaka Samhita, Siddhisthana 1.8
Purvakarmavihinasya shodhane doshasangraha / Na syat karmashu siddhistu prayas tasya viparyayah — Without Purvakarma, the Doshas cannot be gathered for elimination by Shodhana. The procedure will likely fail or produce complications. Purvakarma is not optional — it is the prerequisite that makes Panchakarma safe and effective.

Two components of Purvakarma

1. Snehana — Oleation

Abhyantara Snehana (Internal oleation — Snehapana): Progressive oral administration of medicated ghee on an empty stomach over 3–7 days. Starting dose: typically 30–60ml (Hrasiyasi matra — small dose). Increasing by the same amount each day until Samyak Snigdha (complete oleation) signs are achieved. The ghee penetrates deep tissues, lubricates the channels, and loosens the Ama and Doshas that have accumulated in the deep tissues over years. Without internal oleation, the outer procedures only affect superficial channels.

Samyak Snigdha signs (complete oleation) — documented in Charaka Samhita, Siddhisthana 1: unctuousness of skin (Snigdha Twak), unctuousness of stool (Snigdha Mala), loss of desire for oily foods (Abhakti for Snigdha), lightness of the body (Laghava), and proper digestion of the ghee dose within 24 hours. The practitioner assesses these signs daily to determine when Purvakarma is complete.

Bahya Snehana (External oleation — Abhyanga): Full-body warm oil massage performed daily during Purvakarma. Moves the Doshas from the deep tissues to the skin's surface channels and then toward the GI tract. The direction of massage strokes is documented: along the hair growth direction, with specific strokes for different body regions. Duration: minimum 45 minutes.

2. Swedana — Sudation (Steam/Heat)

Applied after each Abhyanga session, immediately while the channels are open from the oil. Seven types documented in Charaka Samhita — the most common for Panchakarma preparation: Bashpa Sveda (steam box — the patient sits with head outside a steam chamber); Nadi Sveda (tube steam — directed steam to specific body parts); Patra Pinda Sveda (leaf bolus — hot herb-filled boluses massaged onto the body). Swedana opens the skin channels further, liquefies the oil-loosened Doshas, and drives them toward the GI tract for elimination.

Medicated ghee selection by condition
The specific medicated ghee used in Snehapana is determined by the patient's condition and the Panchakarma procedure to follow. Tikta Ghrita (bitter ghee — Mahatiktaka Ghrita, Kalyanaka Ghrita) for Pitta and inflammatory conditions, preceding Virechana. Ashwagandha Ghrita or Shatavari Ghrita for Vata-depletion conditions, preceding Basti. Plain Goghrita (cow's ghee) for general Purvakarma. Brahmi Ghrita for neurological and cognitive conditions preceding appropriate Panchakarma.
Contra-indicators for Purvakarma
Snehapana (internal ghee) is contraindicated in: active Ama burden (the ghee will spread Ama further — Pachana/Ama digestion must precede Snehapana); severe obesity (the Kapha and Meda are already excess — a modified lower-dose Snehapana is used); active fever; and immediately after heavy meals. The practitioner assesses Ama burden through tongue coating, stool quality, and pulse before prescribing Snehapana.