Agastya
Quick Facts
- What it is: Agastya (Sesbania grandiflora) is a single Ayurvedic plant drug, also eaten as a green vegetable.
- Main uses: Cough and stuffy nose, Head pain with a blocked nose, Short fevers, Vitamin A from food
- Best for: Everyday nutrition as a cooked green, Traditional care of a phlegmy cough
- Active ingredients: Beta-carotene, Vitamin C, Iron and calcium, Flavonoids, Saponins, Tannins
- Forms: Cooked leaves and flowers, Fresh leaf juice, Leaf or bark powder, Bark or leaf tea, Nose drops given by an expert
- Time to effect: Days for cough use in old practice; weeks for any food benefit. Not measured in trials.
- Side effects: Usually mild: loose stools, nausea, dry mouth. Avoid in pregnancy.
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What is Agastya?
Agastya is a small, fast-growing tree with large white or red flowers. Its Latin name is Sesbania grandiflora. It is also called swamp pea or agati.
In Ayurveda it is a single drug, not a mix of herbs. Healers use the leaves, flowers, bark and root. They give it for coughs, a blocked nose, fever and head pain.
The leaves and flowers are also a normal green vegetable in India and Southeast Asia. Many people meet this plant as food long before they meet it as a herb.
Here is the short verdict. Human trials are missing, so we rate the proof as thin. Long use in Ayurveda is real, but old use on its own does not prove that a herb works.
How does Agastya work?
No study in people has shown how agastya works. What follows is a best guess drawn from lab and animal tests.
The leaves hold a lot of beta-carotene. Your body turns this into vitamin A, which your eyes and skin need. So part of the effect may simply be good food.
Lab tests suggest the plant holds compounds that calm swelling and slow the growth of some germs. Animal tests also hint at lower blood sugar. These tests were done in dishes and in rats, and they do not prove the same thing happens in a person.
In Ayurveda the plant is seen as cooling and drying. Old texts use it to clear thick phlegm from the head and chest. That is a way of thinking about the body, not a lab finding.
What forms does Agastya come in?
Fresh leaves and flowers, cooked as a vegetable. This is the most common use by far.
Fresh leaf juice, squeezed and strained.
Dried leaf or bark powder.
Bark or leaf tea, boiled down to a small amount.
Leaf juice nose drops, called nasya. A trained Ayurveda expert gives these, not you at home.
Agastya Rasayana is a well-known Ayurvedic jam for coughs. It is a mixed formula with many herbs, so it is a different product from the single plant on this page.
Where it comes from:
Agastya is named after Agastya, a sage in Indian legend. Old Ayurvedic plant books such as the Bhavaprakasha Nighantu list it by name.
The tree grows across India and Southeast Asia and is a common garden and field-edge tree. Village use for coughs, colds and head pain goes back a long way.
In Indian, Thai and Filipino kitchens the flowers and leaves are an everyday vegetable.
Who should avoid Agastya?
- Do not use agastya bark, root, flowers or leaf juice as a herb if you are pregnant. Folk practice has used the bark and flowers to bring on a period or end a pregnancy.
- Do not use it as a herb if you are breastfeeding, unless your doctor agrees.
- Do not use it if you take insulin or any diabetes tablet, unless your doctor checks your blood sugar while you take it.
- Do not use it if you take warfarin or another blood thinner, unless your doctor agrees and can check your levels.
- Do not use it if you have ever had a rash, swelling or trouble breathing after eating beans, peas, lentils or peanuts. Agastya is in the same plant family.
- Never put leaf juice in your nose at home. Nose drops are given only by a trained Ayurveda expert.
- Do not give the bark or root to a child as medicine unless a doctor tells you to.
- Do not use it as a herb if you have long-term liver or kidney disease, unless your doctor says it is safe.
- Do not use it in place of medicine for asthma, pneumonia or any other lung illness a doctor is treating.
When should you see a doctor?
See a doctor if a cough lasts more than two weeks, brings up blood, or comes with chest pain or breathlessness. Get help the same day for a fever above 39C, a fever that lasts more than three days, or a stiff neck with head pain.
Get urgent help if you have swelling of the lips, face or throat, a spreading rash, or trouble breathing after taking it. Stop it and call your doctor if you feel shaky, sweaty or confused, as these can be signs of low blood sugar.
If you are pregnant and have taken it, tell your doctor or midwife.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
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