What is Shyonaka?

Shyonaka is the bark of Oroxylum indicum, a tall tree also called the Indian trumpet tree. In Ayurveda it is a single drug — one plant on its own, not a mixture. It is used in traditional practice for cough, chest congestion, joint pain and weak digestion.

Shyonaka is also one of the ten roots in Dashamoola, a classical Ayurvedic blend. This page is about the single plant, not the blend.

The short verdict: Shyonaka has strong, well-documented standing in Ayurvedic texts, but very little human trial evidence. Almost all modern research is laboratory and animal work. Long traditional use tells you what people have done for centuries; it is not proof that a remedy works, and that gap applies here.

How does Shyonaka work?

Nobody has shown in people how Shyonaka works. What follows is what lab and animal studies suggest, and those findings often do not carry over to humans.

The bark is rich in flavonoids (plant pigments that act as antioxidants). In test tubes, some of these calm the chemical signals that drive swelling and redness. That is the main reason it is studied for joint pain and airway irritation.

Ayurvedic theory describes Shyonaka as bitter, astringent and warming. Classical texts say it settles Kapha and Vata, the body patterns linked in that system to mucus and to pain or dryness. This is a traditional framework, not a measured biological mechanism.

What forms does Shyonaka come in?

Shyonaka is sold and used in several forms.

Dried bark powder (churna) is the most common. Decoction (kwath) is made by boiling the bark in water.

Capsules and tablets are widely sold. These hold the plain powder or a concentrated extract.

The bark is also a fixed part of Dashamoola preparations. That includes Dashamoolarishta, a fermented liquid.

Where it comes from:

Shyonaka appears in the oldest Ayurvedic texts, including the Charaka Samhita and Sushruta Samhita, dating back around two thousand years. It is named there as one of the ten Dashamoola roots. It is also used in Siddha practice and in folk medicine across India, Nepal and Southeast Asia, where the young pods are eaten as a vegetable.

What does Shyonaka help with?

• Cough and chest congestion: This is the best-known traditional use. Ayurvedic texts list Shyonaka bark for wet cough and tight breathing, usually as a decoction or as part of Dashamoola. No published human trial has tested Shyonaka alone for cough, so we cannot say whether it helps.
• Joint pain and stiffness: Traditional practice uses the bark for aching, stiff joints, often in combined formulas. Lab studies show its flavonoids can damp down inflammation signals in cells. That is a long way from proof of pain relief in people, and no trial has tested it for this.
• Poor digestion and bloating: The bitter, astringent taste is why Ayurveda gives Shyonaka for weak appetite and a heavy, bloated feeling after meals. Evidence here is traditional only. There is no human study measuring digestion with Shyonaka.
• Diarrhoea: The bark is high in tannins, which tighten the gut lining, and folk use for loose stools is widespread across South Asia. Animal work supports a slowing effect on the bowel. Human evidence is absent, and diarrhoea with blood, fever or dehydration needs medical care, not a herb.
• Fever and general aches: Dashamoola formulas containing Shyonaka are given traditionally after fever and after childbirth for aches and weakness. Any effect cannot be pinned to Shyonaka, since these are ten-herb mixtures. No trial has separated out the single drug.
• Skin complaints (used on the skin in tradition): A bark paste is applied in folk practice to boils, rashes and slow-healing sores. Animal wound studies report faster closure, but these are small and hard to apply to people. Do not put it on deep, spreading or infected wounds; see a doctor instead.

Which foods are rich in Shyonaka?

1. Young pods of Oroxylum indicum: cooked and eaten as a vegetable in Northeast India, Thailand and Laos
2. Young leaves of the same tree: used in local dishes in Southeast Asia

Practical Tips:

The food use is the pod and leaf; the medicine use is the bark, and the two are not the same thing.

What are the side effects of Shyonaka?

• Stomach upset or nausea
• Loose stools or, in some people, constipation
• Very bitter taste and a dry mouth
• Mild drowsiness in some users
• Skin rash or itch from an allergy (uncommon)

Good to know:

Reported side effects are mild and mostly involve the stomach. Because no proper human safety study of Shyonaka alone exists, rare or long-term effects may simply be unrecorded. Stop taking it and get medical advice if you get a rash, swelling, trouble breathing, or unusual bruising or bleeding.

How much Shyonaka should you take?

• Recommended daily: No dose has been set by human trials, so what follows is traditional practice only. Ayurvedic sources commonly use 3 to 6 grams of dried bark powder a day, split into two doses. A decoction is usually 20 to 30 grams of bark boiled down in water, taken as 50 to 100 ml a day. For capsules and extracts, follow the label — extracts are stronger than plain powder, so the gram amounts above do not apply to them.
• Best time of day: Traditionally taken twice a day, morning and evening. For cough, an evening dose is common.
• With or without food: Usually taken after food with warm water, or mixed with honey. Taking it with food lowers the chance of stomach upset from the bitter, tannin-rich bark.
• Time to effect: Traditional practice expects a few days to two weeks for digestive or cough complaints. There is no trial data on how fast, or whether, it works. If nothing shifts in two weeks, stop.
• How long to take it: Traditional use is short-term, usually two to four weeks for a cough or a digestive spell. If nothing has changed after two weeks, stop and speak to a doctor. Long, continuous use has not been studied for safety in people. Take a break and get advice before going past six weeks.