Sandugeun
Do not self-treat with Sandugeun
If this is an emergency
Some reactions to Sandugeun need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
Who should avoid Sandugeun?
- Do not use if you are pregnant or hope to get pregnant.
- Do not use if you are breastfeeding.
- Never give it to a baby, a child or a teenager.
- Do not use if you have liver disease (a damaged or scarred liver).
- Do not use if you have kidney disease (kidneys that do not work well).
- Do not use if you have an uneven or slow heartbeat, or any other heart problem.
- Do not use if you have epilepsy (a seizure illness) or have ever had a fit.
- Do not use if you take a drug that can harm the liver, such as paracetamol (acetaminophen), isoniazid or methotrexate.
- Do not use if you take heart drugs, seizure drugs, muscle relaxants, or stop-smoking products.
- Never take more than a trained herbalist has weighed out for you.
- Never use it in place of hospital care for cancer or any serious illness.
- Do not use it at all if you cannot see the plant name and the dose on the label.
When should you see a doctor?
Call emergency services right away if you or someone else has a fit, faints, has chest pain, has an uneven heartbeat, or cannot breathe well after taking this root. Take the packet with you.
See a doctor the same day if you feel sick, keep vomiting, feel dizzy, see blurred, or your hands shake. Stop the herb first.
See a doctor soon if your skin or eyes turn yellow, your urine turns dark, or your belly hurts on the right side. These can be signs of liver harm.
Also see a doctor if a sore throat or a neck lump has not cleared in three days.
- What it is: Sandugeun is the dried root of Sophora tonkinensis, a toxic herb used on its own in Korean medicine for a sore, swollen throat.
- Active ingredients: Matrine, Oxymatrine, Cytisine, Flavonoids
- Side effects: Nausea, vomiting and dizziness are common. Fits, heart rhythm problems and liver harm have been reported.
- Pregnancy & breastfeeding: Avoid in pregnancy and while breastfeeding.
Educational information, not medical advice — ask your doctor or midwife.
What is Sandugeun?
Sandugeun is the dried root of a small shrub. Its Latin name is Sophora tonkinensis. It is also called Vietnamese sophora root.
In Korean medicine it is used as a single drug. That means it is given on its own, not inside a herb mix. Healers used it for a sore, swollen throat and for lumps in the neck.
The root is toxic, which means it can poison you. Human trial proof for it is very weak. A long history of use does not prove that a herb works.
How does Sandugeun work?
No one has shown how Sandugeun acts in the human body. The root holds plant chemicals called alkaloids. The two main ones are matrine and oxymatrine.
In lab dishes these chemicals slow the growth of some germs and some cells. Lab work is not proof that the same thing happens in a person.
The same chemicals act on nerves. That is why too much of the root can cause shaking, fits and trouble breathing.
What forms does Sandugeun come in?
You will most often see Sandugeun as dried, sliced root. A herbalist boils it in water to make a tea, called a decoction.
It also comes as a powder, as granules that melt in hot water, and in liquid drops. Some throat mixes list it as one herb among many.
There is no safe over-the-counter form. Buy nothing that does not name the plant and the dose on the label.
Where it comes from:
Sandugeun has been in East Asian herb books for many hundreds of years. The Chinese name is shan dou gen. Korean doctors list it as a single drug for heat and swelling in the throat.
Old texts already warned that the root is strong and can harm. Small doses and short courses were the rule.
What does Sandugeun help with?
- Sore, swollen throat: This is the main old use. Korean and Chinese texts give it for a hot, red, painful throat. We found no human trial that tests it for this.
- Swollen tonsils: Traditional use only. The root was boiled and sipped, or gargled and spat out. There is no trial proof, and a badly swollen throat needs a doctor, not a herb.
- Mouth and gum sores: Old texts list it for sores in the mouth and swollen gums. Proof is limited to tradition and lab work.
- Swollen glands in the neck: Classical use was for lumps and swelling in the neck. Lumps can be a sign of serious illness, so get them checked first.
- Cough with a raw throat: A minor old use, given with other herbs. No human trial supports it.
What are the side effects of Sandugeun?
- Nausea and vomiting
- Belly pain and loose stools
- Dry mouth and a bitter taste
- Dizziness and headache
- Shaking hands or twitching muscles
- Blurred vision
- A fast or uneven heartbeat
- Trouble breathing
- Seizures (fits)
- Liver injury (damage to the liver)
Good to know:
Side effects are common with this root, and some are severe. Nausea, vomiting and dizziness can start at doses close to the old traditional ones.
Case reports from Asia describe fits, heart rhythm problems and deaths after large doses. This is one of the more toxic herbs in the Korean single-drug list.
Treat any shaking, fit, chest symptom or trouble breathing as an emergency.
Options to discuss with a clinician
If you're considering this root for a throat, mouth or gland problem, there are better-studied routes worth putting in front of a clinician first — not as a direct swap, but as a conversation about what is actually causing the symptom.
- **Cough with a raw throat.** A GP or pharmacist can tell whether this is a lingering viral cough, reflux (stomach acid rising into the throat), post-nasal drip, or a side effect of a medicine you already take. Each has its own treatment, and a cough lasting more than three weeks needs assessing rather than suppressing.
- **Mouth and gum sores.** A dentist or doctor can distinguish ordinary ulcers from thrush (a yeast infection), a vitamin or iron shortfall, or a patch that needs a closer look. Any sore lasting more than three weeks should be examined.
- **Sore, swollen throat and swollen tonsils.** Clinicians can test for strep (a bacterial infection that may need antibiotics) and judge whether this is viral. Trouble breathing, swallowing saliva, or drooling is an emergency.
- **Swollen glands in the neck.** These often follow an infection, but glands that stay swollen for weeks, feel hard, or come with night sweats or weight loss need a doctor's assessment.
A registered herbalist or pharmacist can also review anything you already take alongside these.
Review status
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