Educational information, not medical advice — ask your doctor or midwife.
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Ryokankyomishingeninto is a Kampo herbal formula from Japan. In Kampo it counts as a single drug, even though it blends seven herbs. It is also called Poria, Licorice, Ginger, Schisandra, Asarum, Pinellia and Apricot Kernel Decoction (herbs boiled in water).
It is used for a cough that brings up thin, watery mucus. It suits people who feel weak, tired or cold, and it is often given to older adults. Kampo doctors also pick it for a clear runny nose with the same picture.
Human trial evidence is thin. We found no trial that tests this formula against a dummy pill. Its standing rests on long use in Kampo, and long use is not proof that a remedy works.
No one has shown how it works in the body. Kampo theory says it warms the chest and moves out 'cold, thin fluid'. Watery mucus is read as a sign of that fluid.
Lab and animal work hints at a few actions. Licorice may soothe the airway, ginger may warm the gut, and apricot kernel has long been used to quiet a cough. None of this has been tested in people for this formula.
Most often it comes as granules: a water extract that has been dried into a powder. Each dose comes in its own sachet.
A Kampo pharmacy can also boil the raw herbs into a tea for you. Tablets and capsules exist but are less common. Strength differs by brand, so read the label.
The recipe comes from the Jingui Yaolue, a Chinese medical classic about 1,800 years old. Japanese Kampo doctors kept it in use, and it is now a listed Kampo medicine in Japan. It has never been a big seller; it is a narrow, targeted choice.
See a doctor if your cough lasts more than two weeks, gets worse, or wakes you at night. Get help the same day if you cough up blood, run a fever, feel short of breath, or have chest pain. Stop the formula and get checked if your face or ankles swell, your muscles cramp or feel weak, your heart flutters, or your blood pressure climbs.
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 Ryokankyomishingeninto 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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