Bencao Gangmu Reference Library
蓖麻 / 蓖麻子 / 蓖麻油 / 红萆麻 / 勒马 / 肚痛草 — Ricinus communis L. (syn. Ricinus speciosus)
Pinyin: Bìmá / Bìmázǐ / Bìmáyóu · Malay: Jarak / Jarak Minyak / Jarak Budeg / Palma Christi · Family: Euphorbiaceae (大戟科)
Energetics
Neutral to slightly Warm (平 / 微温), Raw Seeds Extremely Toxic / Lethal (有大毒 / 剧毒 / 致命毒蛋白)
Flavor
Sweet, pungent, acrid, oily, nauseating (甘、辛、平、有大毒、极麻舌)
Meridians
Large Intestine (大肠), Lung (肺), Liver (肝), Stomach (胃)
Traditional Edict
Castor Bean (Jarak / Bi Ma / Palma Christi). Palmately lobed leaves and marbled mosaic seeds. Supreme acupoint plaster for peripheral facial paralysis (Bell's Palsy / Kou Yan Wai Xie) and drastic bowel cathartic. RAW SEEDS LETHALLY TOXIC (Ricin RIP-II).
Cautions & Contraindications
- LETHAL RICIN POISONING HAZARD: Ingestion of 2-4 raw crushed seeds can kill a child; 6-10 can kill an adult. Steam-heating (>100C) denatures ricin. ABSOLUTELY CONTRAINDICATED IN PREGNANCY (potent abortifacient) and bowel obstruction.
Clinical Applications
- Acute peripheral facial nerve paralysis (Bell's palsy contralateral acupoint plaster), severe acute fecal impaction (short-term purgation), cervical ripening induction, and cutaneous boil pus extrusion.
Quality Markers
Mechanism & Phytochemistry
1. Ingested castor oil hydrolyzes into ricinoleic acid, activating EP3 prostanoid receptors on intestinal smooth muscle to drive peristalsis. 2. Pounded seed plaster causes trigeminal reflex vasodilation. 3. Raw ricin inactivates 28S rRNA ribosomes.
Preparation & Dosage
THE SOVEREIGN BELL'S PALSY FACIAL DRAWING PLASTER: 7 to 10 hulled seeds pounded into paste, spread on silk patch, applied strictly to CONTRALATERAL (HEALTHY) CHEEK over acupoints Jiache (ST6) and Dicang (ST4) for 4-6h daily until symmetry returns. Oil: 10-30 mL.
Appended Prescriptions
- 1. Sovereign Bell's Palsy Facial Drawing Synergy (Contralateral Plaster) with internal Qian Zheng San. 2. Deep Cutaneous Carbuncle Pus-Drawing Paste with Pinellia ternata (Fa Ban Xia).
Yemama Apothecary · Petaling Jaya, Malaysia · For educational and clinical reference only
