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jeonho

Traditionally used for: Short-term use inside a traditional cough formula. Cough with thick phlegm; Chest tightness; Cough during a common cold.

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What is jeonho? Jeonho is the dried root of the plant Peucedanum praeruptorum. It is a single drug in Korean herbal medicine, not a mixed formula. It is also sold as hogfennel root, and the same root is called qianhu in China. Herbalists give it for a cough with thick phlegm (thick mucus). It is also used for a tight or stuffy chest and for a cough that comes with a cold and mild fever. It is nearly always boiled with other herbs, not used on its own. Here is the plain verdict. The traditional record is long, but good human trials are lacking. Long use is not proof that a herb works, and that point is made once here rather than in every section below. How does jeonho work? No one has shown how jeonho works in people. The ideas below come from lab dishes and animal tests, not from patients. The root holds coumarins (natural plant compounds). In lab work these seem to loosen airway muscle and cut the amount of mucus made. Some also slow calcium moving into cells, which is how several blood pressure drugs act. In Korean tradition the root is said to push "wind-heat" out and to move phlegm downward. That is a traditional idea, not a lab finding. Treat all of this as a theory that has not been tested in humans. What forms does jeonho come in? Sliced dried root is the usual form. You boil it in water with other herbs to make a decoction (a water extract). Other forms you may see: - Ready-made granules or powders you stir into hot water - Capsules of ground root - Liquid tinctures (alcohol extracts) - Patent formulas where jeonho is one of many listed herbs Raw root and honey-fried root are both used in East Asia. The honey-fried form is the milder one in tradition. Where it comes from: Jeonho has been used in Korea for centuries and appears in classical Korean medical texts, including the Donguibogam of 1613. The same root has an even older record in Chinese medicine under the name qianhu, and it is also used in Japanese herbal practice. Its classic job in all three traditions is the same: a cough with thick phlegm and a stuffy chest. It has always been a team player, given inside a formula rather than alone.

Helps

What does jeonho help with? Cough with thick phlegm (thick mucus): This is the main traditional use in Korea, China and Japan. Herbalists pick it when a cough brings up thick, sticky, yellow phlegm. Human trial evidence for jeonho alone is missing. Lab and animal studies suggest the coumarins in it may thin mucus, but that has not been tested in people. Chest tightness and a stuffy feeling in the chest: Tradition pairs jeonho with herbs that move phlegm downward for a full, tight chest that comes with a cough. There are no published human trials for this use. Chest tightness can also be a sign of heart or lung trouble, so get it checked before you treat it yourself. Cough and stuffy nose during a common cold: In classical use jeonho is added to formulas for a cold with fever, headache and a phlegmy cough. No human trial has tested it for colds. A cold clears on its own in a week or two, which makes any herb hard to judge without a proper trial. Wheezing (a whistling sound when you breathe): Animal work suggests the coumarins relax airway muscle. That is interesting, but it is a long way from proof in people. Do not swap jeonho for an inhaler or any asthma medicine. Stopping prescribed asthma treatment can be dangerous.

jeonho

Quick Facts

  • What it is: Jeonho is the dried root of Peucedanum praeruptorum, a single herb drug in Korean medicine used mainly for a cough with thick phlegm (thick mucus).
  • Main uses: Cough with thick phlegm, Chest tightness, Cough during a common cold
  • Best for: Short-term use inside a traditional cough formula
  • Active ingredients: Praeruptorin A, Praeruptorin B, Praeruptorin C, Praeruptorin D, Umbelliferone, Aromatic oil
  • Forms: Dried sliced root for decoction, Granules, Powder, Capsules, Tincture
  • Time to effect: Not measured in people; tradition expects a few days.
  • Side effects: Mostly mild stomach upset; the real concern is bleeding risk with blood thinners.
  • Pregnancy & breastfeeding: Not studied in pregnancy; avoid unless your clinician advises otherwise.

Educational information, not medical advice — ask your doctor or midwife.

What is jeonho?

Jeonho is the dried root of the plant Peucedanum praeruptorum. It is a single drug in Korean herbal medicine, not a mixed formula. It is also sold as hogfennel root, and the same root is called qianhu in China.

Herbalists give it for a cough with thick phlegm (thick mucus). It is also used for a tight or stuffy chest and for a cough that comes with a cold and mild fever. It is nearly always boiled with other herbs, not used on its own.

Here is the plain verdict. The traditional record is long, but good human trials are lacking. Long use is not proof that a herb works, and that point is made once here rather than in every section below.

How does jeonho work?

No one has shown how jeonho works in people. The ideas below come from lab dishes and animal tests, not from patients.

The root holds coumarins (natural plant compounds). In lab work these seem to loosen airway muscle and cut the amount of mucus made. Some also slow calcium moving into cells, which is how several blood pressure drugs act.

In Korean tradition the root is said to push "wind-heat" out and to move phlegm downward. That is a traditional idea, not a lab finding. Treat all of this as a theory that has not been tested in humans.

What forms does jeonho come in?

Sliced dried root is the usual form. You boil it in water with other herbs to make a decoction (a water extract).

Other forms you may see: - Ready-made granules or powders you stir into hot water - Capsules of ground root - Liquid tinctures (alcohol extracts) - Patent formulas where jeonho is one of many listed herbs

Raw root and honey-fried root are both used in East Asia. The honey-fried form is the milder one in tradition.

Where it comes from:

Jeonho has been used in Korea for centuries and appears in classical Korean medical texts, including the Donguibogam of 1613. The same root has an even older record in Chinese medicine under the name qianhu, and it is also used in Japanese herbal practice.

Its classic job in all three traditions is the same: a cough with thick phlegm and a stuffy chest. It has always been a team player, given inside a formula rather than alone.

Who should avoid jeonho?

  • Do not use if you take warfarin, apixaban, rivaroxaban, heparin or any other blood thinner (a drug that stops clots).
  • Do not use if you take aspirin or clopidogrel to keep your blood from clotting.
  • Do not use if you have a bleeding disorder such as haemophilia (a condition where blood does not clot properly).
  • Do not use if you are pregnant or trying to become pregnant; safety has not been studied.
  • Do not use if you are breastfeeding.
  • Do not use in the two weeks before any planned surgery or dental surgery.
  • Do not use if you are allergic to carrot-family plants such as carrot, celery, parsley, fennel or dill.
  • Do not give it to a child unless a qualified practitioner has advised it and set the dose.
  • Never use it in place of an asthma inhaler or any prescribed lung medicine.
  • Do not use if you take medicines cleared by CYP3A4 (a liver enzyme that clears many drugs), such as statins, ciclosporin or some HIV medicines, unless your doctor agrees.

When should you see a doctor?

See a doctor if your cough lasts more than three weeks, or if it has not improved after a week of taking jeonho.

Get medical help the same day if you cough up blood, have a high fever, are short of breath, or have chest pain.

Stop jeonho and get checked if you bruise easily, bleed from your gums or nose, see blood in your urine or stool, or pass black tarry stools. Also stop and seek advice if you get a rash, swelling of the face or mouth, or yellow skin or eyes.

Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.

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