Last verified: April 2026

Eranda (Castor)

एरणड — Eranda — "that which gives pleasure — named for its therapeutic comfort in Vata conditions"

Eranda is the primary classical Vatahara and purgative herb for Vata conditions — its oil (Eranda Taila / castor oil) is simultaneously the most potent single-herb Vatahara Virechana (purgative) in classical Ayurveda and one of the primary Basti oil bases for Vata conditions. Charaka Samhita places Eranda oil as the first-choice purgative for Vata-dominant conditions — where most purgatives aggravate Vata, Eranda's unctuous quality purges without drying.

Important noticeThis page documents what classical texts record. Not medical advice. Consult a qualified practitioner. Full disclaimer

Charaka Samhita, Chikitsasthana 28.78

Erandatailam Vata roga uttamam — Eranda oil is the best medicine for Vata diseases. It purges without drying the channels, lubricates while eliminating, and reaches the deep Vata channels that dry purgatives cannot access.

Three classical applications

Oral Eranda Taila for Virechana (purgation): 15–30ml castor oil on empty stomach (warm, with warm water or milk) is the classical Vata-appropriate Virechana preparation. Unlike Trivrit (the primary Pitta purgative) which is drying, castor oil lubricates while purging — making it the only Rechana appropriate for Vata-dominant conditions and for elderly patients where Trivrit would be too depleting.

Eranda Taila in Anuvasana Basti: Castor oil is a standard component of classical Anuvasana (unctuous) Basti preparations for Vata conditions. Administered rectally in the Basti protocol, it specifically nourishes and lubricates the colon channels.

Eranda Mooladi Kashaya (root decoction): Erandamooladi Kwatha — the root decoction — is the primary classical preparation for Amavata (rheumatoid-type arthritis), Sandhivata (osteoarthritis), and Gridhrasi (sciatica). The root has different pharmacological properties from the oil — Shoolahara (analgesic) and Shothaghna (anti-inflammatory) as primary actions, with the warming Vatahara properties reaching the joint channels.

Ricinoleic acid — mechanism of action

Castor oil's primary component — ricinoleic acid (approximately 90% of fatty acid content) — is the documented active compound for its purgative action. Ricinoleic acid binds EP3 prostaglandin receptors in the intestinal wall, producing fluid secretion and intestinal contraction. This mechanism was published in Cell (Buhner et al., 2003) — it is unusually specific for a plant compound and explains the reliable, dose-dependent purgative action that made Eranda oil the primary classical Vata Virechana preparation.

Pregnancy contraindication — absolute

Eranda Taila (castor oil) stimulates uterine contractions through the same prostaglandin mechanism as its intestinal action. It has been used historically as a labour-inducing agent. Absolutely contraindicated in pregnancy for both oral and rectal administration. Topical application to joints is considered safer but caution is warranted.