Elabatu / Katuwelbatu (Solanum virginianum): The Thorny Nightshade for Coughs

Elabatu (Solanum virginianum) is the low, viciously spiny weed with purple flowers and yellow marble-sized berries that sprawls across dry-zone wasteland — and one of the ten roots of dashamula, the most famous compound formula in Ayurveda. Known as kantakari in Sanskrit, it is the classical medicine for coughs, asthma and chest congestion, and a 2024 systematic review counted more than three hundred compounds behind that reputation.

Botanical and Cultural Background

A perennial herb of the nightshade family, elabatu spreads flat over the ground with leaves and stems armed with straight yellow spines. The berries ripen from green-striped to yellow and are toxic when raw. In Sri Lanka the plant goes by two names, elabatu and katuwelbatu, and appears in numerous decoctions for respiratory illness; the root is the part used in dashamula, while the whole plant and fruit feature in the classical cough preparation kantakari ghrita.

Traditional Uses in Sri Lankan Medicine

• Cough, asthma and bronchitis — root or whole-plant decoction, often combined with thippili (long pepper) and ginger.
• Fever — as an ingredient of dashamula and peyawa (fever decoctions).
• Toothache — seed smoke or fruit juice held on the tooth in older practice.
• Urinary complaints — root decoction as a diuretic.

What the Research Shows

A 2024 PRISMA systematic review covering publications from 1753 to 2023 identified 338 metabolites in the plant — terpenoids, phenols and steroidal alkaloids such as solasodine — and documented bronchodilator, antitussive, anti-asthmatic, antimicrobial and immunomodulatory activity in laboratory and animal studies. A 2023 review in Plant Science Today reached similar conclusions and highlighted anti-inflammatory effects relevant to airway disease. Human evidence remains limited to small older trials of Ayurvedic formulations in bronchial asthma; no modern controlled trial has tested the plant alone.

Evidence updated September 2026.

How Elabatu Is Prepared

The plant is generally used within prepared formulations from a qualified practitioner rather than as a home remedy. The traditional decoction uses a tablespoon of dried root or whole plant in two cups of water, reduced by half, taken twice daily for coughs, often with a little bee honey. Dashamula decoctions and kantakari ghrita are obtained from Ayurvedic pharmacies.

Safety and Precautions

The raw berries are poisonous, especially to children — this is a nightshade, and its steroidal alkaloids can cause vomiting, drowsiness and worse. Use only properly prepared decoctions in traditional doses, avoid in pregnancy and breastfeeding, and do not combine with sedatives. Handle the plant with gloves; the spines cause painful, easily infected punctures.