Educational information, not medical advice — ask your doctor or midwife.
Shosaikotokakikyosekko is a Kampo herb formula from Japan. Its longer name is Minor Bupleurum Decoction plus Platycodon and Gypsum. It is used most often for a sore throat with fever, such as pharyngitis (a sore throat) or tonsillitis (red, swollen tonsils).
It is classed as a single drug (Kampo). That means it is one fixed, standard mix. You take it as a whole, not as loose herbs you blend at home.
Here is the short verdict. People in Japan have used it for a long time, but strong human trials for this exact formula are hard to find.
It also carries rare but serious lung and liver risks. So it is not a casual home remedy. Long traditional use shows what people have done; it is not proof that a remedy works.
No one has shown how this formula works in the body. What follows is the traditional idea plus some lab work.
Kampo theory says it clears heat and phlegm stuck between the surface and the inside of the body. In plain words, it is picked for a fever that comes and goes with a hot, painful throat.
Each part has a job in that theory. Platycodon root is said to open the throat and move phlegm. Gypsum, a calcium mineral, is said to cool fever.
Lab and animal studies show some parts can calm swelling and slow some germs in a dish. That kind of work does not tell you what happens in a person. Treat the idea of how it works as a theory, not a fact.
Most people take it as a dry granule powder that you stir into hot water. In Japan it is a listed prescription and is also sold over the counter.
Tablets and capsules exist as well. A traditional decoction (a tea boiled from raw herbs) is used too, but that is less common now.
Strength differs from maker to maker. Always follow the label on the box you have, not a dose from another brand.
Minor Bupleurum Decoction comes from the Shang Han Lun, a Chinese medical text from about 200 CE. Chinese and Japanese doctors have used it for well over a thousand years.
Japanese Kampo doctors later added platycodon root and gypsum. The goal was to aim the base formula at a hot, painful throat.
This version became a Kampo staple. Japan lists it as a single drug (Kampo) under its national health insurance.
Some reactions to Shosaikotokakikyosekko need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
Get medical help the same day if you get a new dry cough, trouble breathing or a fever while taking it. These can be early signs of lung injury. Stop the formula first.
Get help fast if your skin or the whites of your eyes turn yellow, your urine turns dark, or you feel very tired. Those point to liver trouble.
Also see a doctor if you get bad muscle weakness or cramps, swollen ankles, or an odd heartbeat. And see a doctor if your sore throat is no better in five days, if you cannot swallow, or if you struggle to breathe.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
Reviewed by the HealisticMD editorial team How we grade evidence →
The published evidence for Shosaikotokakikyosekko is weak or absent. That usually means no controlled trial has tested it, not that a trial found it ineffective — the two are different, and we grade only what has been published.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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