Educational information, not medical advice — ask your doctor or midwife.
Medina (Alysicarpus vaginalis) is a low, creeping legume used as a single-herb tea in Caribbean, Latin American and West African home medicine. The whole above-ground plant is boiled in water and drunk, most often for urinary complaints, coughs and colds, and as a general "cleansing" tea.
The honest verdict on evidence is short: there are no published human trials of Medina for any condition. What exists is laboratory and animal work, which cannot tell you whether the tea helps a person.
Traditional use and proof of effect are two different things. A plant can be used for centuries and still turn out to do nothing measurable — long use tells you a remedy is familiar and broadly tolerated, not that it works. You will not see that point repeated below; it applies to everything on this page.
Nobody has shown how Medina works in people, because that has not been studied.
Laboratory screening of the plant has found flavonoids and other plant polyphenols (plant pigments that mop up reactive molecules in a test tube). Rodent studies have reported mild diuretic (urine-increasing) and blood-sugar-lowering effects, but rodent results often fail to repeat in humans.
The traditional explanation is simpler: the tea is thought to "flush" the kidneys and bladder and soothe irritation. Drinking a litre of warm fluid does increase urine output on its own, so some of the effect people notice may be the water rather than the plant.
Medina is almost always used fresh or dried, not as a manufactured supplement.
Common forms:
Fresh or dried aerial parts (stems, leaves, small flowers) sold in bundles at market stalls.
A decoction — the plant simmered in water for 10 to 15 minutes, then strained and drunk warm.
A cold infusion left to stand overnight, used in some Caribbean households.
Occasional bottled "bush tonic" blends that contain Medina alongside other herbs. Blends make it impossible to know what you are reacting to, so a single herb is easier to judge.
Medina grows wild across the tropics and spread widely as a pasture legume, which is part of why it turns up in so many folk pharmacopoeias. In Caribbean and Latin American bush medicine it is a household tea for urinary complaints and colds, passed down orally rather than through written texts.
Related use is recorded in West Africa and in South and Southeast Asia, where the same plant is applied for fever, coughs and swellings. Its standing is that of a familiar everyday remedy rather than a formal medical staple.
See a doctor straight away if you have burning when you pass urine, blood in your urine, fever with back or side pain, or you cannot pass urine — these point to a urinary infection or a kidney problem that a tea will not fix.
Get urgent help for swelling of the lips, tongue or throat, a spreading rash, or trouble breathing after taking it.
See your doctor within a day or two for a fever lasting more than three days, a cough lasting more than three weeks, coughing up blood, or repeated dizziness and cramps while drinking this tea. Tell any doctor or pharmacist that you are using it, especially if you take prescription medicines.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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