Educational information, not medical advice — ask your doctor or midwife.
Ogonto is a Japanese Kampo herbal mix, taken as a warm tea-like drink, used for short bouts of diarrhoea with fever and belly cramps. It is also known as Scutellaria decoction. It is a single drug (Kampo), meaning one fixed formula given on its own rather than combined with other Kampo formulas.
The classic target is acute enteritis (a sudden inflammation of the gut lining) with fever and watery diarrhoea. Traditional practice reaches for it when the belly pain is cramping and the person feels hot rather than chilled.
Here is the honest verdict up front. Ogonto has a long, well-documented history but almost no modern human trial evidence of its own. Traditional use tells you people have relied on it for centuries; it is not proof that it works.
No one has shown exactly how Ogonto works in the body. Laboratory work suggests its lead herb, ogon (Scutellaria root), holds compounds that calm inflammation (swelling and irritation) in gut tissue. Lab findings do not always carry over to people.
In Kampo terms, the formula is said to clear "heat" from the gut and settle cramping. Shakuyaku (peony root) is the part traditionally credited with easing painful spasms. Those are traditional descriptions of an effect, not measured biology.
Most people take Ogonto as a dried granule or powder extract in single-dose sachets. You stir a sachet into hot water and drink it.
Some makers press the same extract into tablets or capsules for people who dislike the bitter taste. A traditional decoction, where raw herbs are simmered in water, is less common today.
Prescription-strength Ogonto granules are covered by Japan's national health insurance. Outside Japan, strength and quality vary widely between brands, so check the label for how much licorice each dose contains.
Ogonto comes from the Shanghan Lun, a Chinese medical text compiled around 200 CE, where it appears as huang qin tang. Japanese physicians took it into Kampo practice, and it became a standard formula during the Edo period (1603-1868).
It is still on Japan's list of insured Kampo formulas. Its classical role has barely changed in eighteen centuries: fever with diarrhoea and cramping belly pain.
See a doctor now if your diarrhoea lasts more than three days, contains blood, or comes with a high fever. Get urgent help if you cannot keep fluids down, pass very little urine, feel dizzy standing up, or your child or an older relative is drooping and drowsy.
Stop Ogonto and contact a doctor the same day if you notice yellow skin or eyes, dark urine, a new dry cough with breathlessness, sudden swelling of the legs or face, marked muscle weakness, or a pounding or irregular heartbeat.
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 Ogonto 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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