What is Kalamegha?

Kalamegha is a very bitter leaf used in Ayurveda. Its plant name is Andrographis paniculata. People also call it Kalmegh, green chiretta, or king of bitters.

In Ayurveda, Kalamegha is a single drug. That means one herb used on its own, not a blend of many herbs. It is used most often for fever, colds, weak digestion, and to support the liver.

The short verdict: small human trials suggest it may ease cold and sore throat symptoms a bit. The proof is fair, not strong. Long use in Ayurveda is not the same as proof that a herb works, and this page keeps the two apart.

How does Kalamegha work?

No one can say for sure how Kalamegha works in the body.

Lab work shows its bitter compounds may calm inflammation (swelling and heat in body tissue). They may also prompt the body's germ defences to react sooner. Some lab work also suggests it helps bile flow, which may be why it has a name as a liver herb.

Most of this work was done in test tubes and in animals. That does not prove the same thing happens in a person. Treat these as ideas, not facts.

In Ayurveda it is read as a cooling, bitter, drying herb that clears heat from the blood and liver.

What forms does Kalamegha come in?

Kalamegha comes in several forms. Dried leaf powder, called churna, is the oldest one. Tablets and capsules of plain powder are common.

Fixed-strength extracts are what most trials used. A bitter water brew, called kwatha, is made by boiling the leaf. Fresh leaf juice is still used in parts of India.

Choose a product that names the plant in full and states the andrographolide content.

Where it comes from:

Kalamegha has a long record in Ayurveda as a fever and liver herb. Old texts group it with the bitter, heat-clearing plants.

It is also used in Siddha and Unani practice in India. In China the same plant is called chuan xin lian and has its own long record there. During past fever outbreaks in India it was a household remedy.

What does Kalamegha help with?

• Common cold and flu-like illness: This is the best studied use. Pooled trials suggest people taking Kalamegha felt better a little sooner than those on a dummy pill. The effect is modest and the trials were small. It is a symptom helper, not a cure.
• Sore throat and cough: Trials that measured cough and throat pain scores found small gains over a dummy pill. Most courses ran 3 to 7 days. Quality of the studies was mixed, so read the result as promising, not settled.
• Fever: Fever is the classic Ayurvedic use, going back centuries. Human trial proof for fever on its own is thin. If a fever lasts more than three days, or goes above 39C (102F), see a doctor rather than treating it yourself.
• Poor appetite and slow digestion: Bitter herbs are used to wake up appetite and bile flow, and Kalamegha is a strong bitter. This use rests on tradition and on lab work, not on good human trials. In large doses the same bitterness can upset the stomach.
• Liver support (traditional use): Ayurveda uses Kalamegha for liver heat and for jaundice (yellow skin and eyes). Animal work is supportive. We could not find human trials strong enough to guide advice. Odd rare reports also link the herb to raised liver test results, so people with liver disease should stay away.
• Skin problems with heat and itching (traditional use): Old texts use it for hot, itchy, weeping skin, taken by mouth. This is tradition only. No sound human trials back it.
• Intestinal worms (traditional use): Kalamegha appears in old worm remedies. Modern drugs for worms are safe, cheap and proven, so there is no good reason to pick the herb instead.

Which foods are rich in Kalamegha?

1. No everyday food holds Kalamegha: it is a medicinal leaf, not a vegetable or spice

Practical Tips:

You cannot get it from your diet; it comes only as a herb product or brew.

What are the side effects of Kalamegha?

• Strong bitter or metallic taste
• Nausea and stomach ache
• Loose stools or diarrhoea
• Loss of appetite at higher doses
• Headache and tiredness
• Runny nose
• Skin rash or itching
• Rare: swelling of the face, lips or throat, and trouble breathing (a severe allergic reaction)
• Rare: raised liver test results

Good to know:

Most side effects are mild and settle when you stop or lower the dose. Stomach upset and the bitter taste are the common ones.

Severe allergic reactions are rare but have been reported. They are a medical emergency.

Animal work has raised questions about effects on male fertility and on pregnancy. This has not been settled in people, which is one reason the herb is not for anyone trying for a baby.

How much Kalamegha should you take?

• Recommended daily: No official dose has been set. Trials for colds most often used about 200 mg a day of a fixed-strength extract, split into two or three doses. Extract labels often suggest 300 to 1200 mg a day. Traditional plain leaf powder is used at roughly 1 to 3 g a day. Start at the low end. More is not better with this herb; the main side effects grow with the dose.
• Best time of day: Split the day's amount into two or three doses. Morning and evening works for most people. Avoid a dose right before bed if it upsets your stomach.
• With or without food: Take it with food or straight after a meal. The herb is very bitter and can turn the stomach when taken empty.
• Time to effect: For cold and throat symptoms, trials saw a change within 2 to 4 days. Appetite effects may show within a few days. One dose will not do much.
• How long to take it: Use it as a short course. For a cold, 5 to 10 days is the usual span, and that matches the trials. If you feel no change after a week, stop and rethink. Long daily use for months has not been well studied, so do not do it without a doctor or a trained Ayurvedic practitioner watching you.