Eden Apothecary · Herb Profile
Justicia adhatoda L. (syn. Adhatoda vasica Nees)
Also known as Vasa, Vasaka
Pronounced Vasa: VAH-sah (also Vasaka, VAH-sah-kah). Malabar Nut. Justicia adhatoda: juss-TISS-ee-uh ad-hah-TOH-duh.
Cool and drying: a bitter, astringent respiratory relaxant that clears hot, thick, tenacious phlegm, eases the constricted, wheezing airway, and cools the heat in the blood that bleeds.
Avoid. Vasa's principal alkaloid vasicine is a documented uterine stimulant with oxytocic activity similar to oxytocin and a well-reported abortifacient effect, an action enhanced under estrogen priming (Vasicine, alkaloid of Adhatoda vasica, a promising uterotonic abortifacient, PMID 750386; Claeson and colleagues, Adhatoda vasica: a critical review of ethnopharmacological and toxicological data, J Ethnopharmacol 2000;72(1-2):1-20). It is contraindicated in pregnancy in The Ayurvedic Pharmacopoeia of India and by modern review. A minority of Ayurvedic sources describe tiny doses with ginger for pregnancy nausea, but given the documented uterotonic and abortifacient pharmacology the prudent and standard position is to avoid Vasa in pregnancy.
No reliable modern data on the safety of Vasa during lactation. In the absence of data, and given the potent alkaloid content, avoid therapeutic and medicinal-strength doses while breastfeeding (insufficient data; precautionary, per Brinker, Herbal Contraindications and Drug Interactions).
Vasa leaf, as a low-dose leaf-juice-with-honey or syrup (linctus), has a long traditional use for children's coughs on the Indian subcontinent. Modern pediatric safety data are limited, so use only low, traditional doses under qualified guidance, and avoid in infants. Do not give medicinal doses to a child without professional supervision.
At ordinary therapeutic doses the leaf is well tolerated; large doses may cause nausea, vomiting, diarrhea, and gastric irritation. The principal and best-documented hazard is in pregnancy: the leaf's chief alkaloid vasicine (peganine) is a uterine stimulant with oxytocic activity comparable to oxytocin and a documented abortifacient effect, so medicinal doses must be avoided in pregnancy (see the pregnancy field). This oxytocic and abortifacient action is enhanced by estrogen priming. Vasicine and the related vasicinone also show cardiovascular activity (hypotensive and cardiac-depressant effects in animal studies), so caution is reasonable in those on blood-pressure or cardiac medication, though human interaction data are limited.
Pregnancy (uterine-stimulant, abortifacient alkaloid vasicine). Known hypersensitivity to the plant. Caution with concurrent uterotonic drugs (additive uterine stimulation) and, on limited data, with antihypertensive or cardiac-glycoside therapy. Cold, weak, deficient, and frankly dry constitutions on energetic grounds, since a cooling drying herb aggravates them.
Justicia adhatoda is not at risk. It is a hardy, fast-growing, often weedy evergreen shrub, widely cultivated and naturalized across the Indian subcontinent, where it is grown as a hedge, a green manure, and a bio-pesticide, and harvested leaf comes overwhelmingly from abundant cultivated and wild-common stands. It is not listed by United Plant Savers (a North American native-plant registry). Prefer cultivated leaf.
Not in the canonical biblical texts. Vasa is native to the Indian subcontinent and adjacent Asia (its range runs from Afghanistan to Indo-China) and belongs to the Ayurvedic and Unani traditions rather than the Mediterranean-biblical world. It is described in the classical Ayurvedic samhitas (Charaka, Sushruta) and is included in The Ayurvedic Pharmacopoeia of India.
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