Shomakakkonto
Quick Facts
- What it is: A four-herb Kampo formula taken in the first days of a fever with a skin rash.
- Main uses: Early fever with rash, First days of a measles-like rash, Red, itchy skin rashes
- Best for: Short-term traditional use at the start of a rash illness, under a prescriber
- Active ingredients: Puerarin and daidzein from kudzu root, Cimicifuga triterpene glycosides, Paeoniflorin from peony root, Glycyrrhizin from licorice root
- Forms: Granules, Powder packets, Tablets, Boiled herb tea
- Time to effect: Traditional use expects a day or two; no trial has measured it.
- Side effects: Mild stomach upset is most common; licorice can raise blood pressure and drop potassium.
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What is Shomakakkonto?
Shomakakkonto is a Kampo herb formula from Japan. Its other name is Cimicifuga and Pueraria Decoction. It is a Single drug (Kampo): the four-herb mix counts as one product, and you take the whole set as it comes.
Kampo prescribers use it early in a fever with a skin rash. The classic case is the first days of a measles-like rash, when the fever has come and the spots are just showing. It is also used for some red, itchy rashes.
Here is the verdict in one line. Traditional standing is long, but modern human trial data is close to none. Traditional use is not proof that a remedy works, and that holds for this one too.
One more thing to know up front. The mix contains licorice root, so it is not a risk-free herb tea. Licorice can raise blood pressure and drop potassium in the blood, which is why this page is marked with a caution tier.
How does Shomakakkonto work?
Nobody has proven how it works. The Kampo idea is that the mix helps a rash come out to the skin and cools "heat" in the body, so the fever passes sooner.
Lab work gives a few hints. Kudzu root holds plant compounds that calm swelling signals in cell and animal tests. Peony root and licorice root do something similar in the lab.
Lab dishes and mice are not people. No study shows that this formula changes how a rash illness runs in humans. Read the idea above as theory, not fact.
What forms does Shomakakkonto come in?
Most people in Japan take it as a dry granule or fine powder, sold in single-dose packets. You stir the dose into warm water and drink it.
Tablets and capsules of the same extract are also sold. A few practitioners still boil the raw herbs into a tea, which is the old way.
Strength differs between brands. Check the licorice amount on the pack, since that sets much of the risk.
Where it comes from:
The recipe comes from Chinese medical texts written about a thousand years ago, in the Song era. It was aimed at children with fever and early rash.
Japanese doctors took it up and reshaped it during the Edo period, and it became part of the Kampo set of standard formulas. It stayed in use in Japan as a listed Kampo product.
So the paper trail is old and steady. That is a fact about custom, not about proven effect.
Who should avoid Shomakakkonto?
- Do not use if you have low potassium in your blood (hypokalaemia, meaning low potassium).
- Do not use if you have aldosteronism (a hormone problem that raises blood pressure and drops potassium).
- Do not use if you have myopathy (muscle disease) or ongoing muscle weakness of unknown cause.
- Do not use if you take a water pill (diuretic) such as furosemide or hydrochlorothiazide.
- Do not use if you take digoxin (a heart medicine) unless a doctor checks your potassium first.
- Do not use if you have heart failure, kidney failure, or high blood pressure that is not under control.
- Do not use if you have liver disease, or if you have had liver injury from a medicine or herb before.
- Do not use if you are allergic to kudzu, peony, licorice or Cimicifuga.
- Do not use if you are pregnant or breastfeeding, unless your own doctor has told you it is safe.
- Never give it to a baby or child without a doctor or Kampo prescriber setting the dose.
- Never use it in place of medical care for measles, or for any rash with a high fever.
- Do not use it alongside another licorice-containing product, formula, tea or sweet.
When should you see a doctor?
See a doctor the same day if a fever with rash keeps climbing, if the rash spreads fast, blisters or turns purple, or if you feel very unwell.
Go straight to emergency care for trouble breathing, a stiff neck with headache, confusion, or a rash that does not fade when you press it.
Stop the formula and call a doctor if your ankles or face swell, your blood pressure climbs, your muscles feel weak or crampy, or your heartbeat feels odd. Also stop and get checked for yellow skin or eyes, dark urine, deep tiredness, or a new dry cough with breathlessness.
If the fever or rash is no better after two or three days, get it looked at rather than carrying on.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
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