Educational information, not medical advice — ask your doctor or midwife.
Siguapate is a leafy shrub used as a home remedy across Latin America and the Caribbean. Botanists call it Pluchea carolinensis. In English it is often called sourbush.
The leaves are the part people use. They are brewed into a bitter tea, or crushed and laid on the skin. Folk healers reached for it mainly for coughs, colds, aches and swelling.
Its nickname is "cure-for-all". That is a nickname, not a finding. Long traditional use is not proof that a plant works, and it is not proof that it is safe.
Here is the honest verdict. Nearly all the research sits in test tubes and animals. No solid human trials show that siguapate treats any illness.
Nobody has shown how siguapate acts in the human body. What follows comes from the laboratory bench, not from patients.
In rodent tests, leaf extracts cut swelling in a treated paw. Some of the same studies reported less pain behaviour in the animals. Whether a cup of tea does anything like this in a person is unknown.
In test tubes, extracts slow the growth of some bacteria and fungi. They also soak up free radicals, which is the standard antioxidant dish test. A dish is not a throat, a lung or a wound.
The traditional idea was simpler. The hot, bitter brew was thought to "move" a stuck chest and loosen phlegm. Warm fluids do soothe a sore throat, and that may explain part of what people felt.
So treat any mechanism story you read about siguapate as a theory. It has not been tested in people.
Dried leaf for tea is the form you will meet most often. It is sold loose in markets and herb shops.
Tinctures steep the leaf in alcohol. Syrups mix the brew with honey and are aimed at cough.
Healers also made leaf baths and skin washes. Fresh crushed leaves were laid on sores and bruises.
Capsules and liquid extracts turn up online. Labels rarely state the strength. Quality checks on these products are weak or absent.
Siguapate has a long place in Central American and Caribbean home medicine. Records and market surveys name it in Honduras, Guatemala, Belize, Cuba and Puerto Rico.
Healers brewed the leaves for chest colds, cough and "cold in the bones". Washes and poultices were used on sores, bruises and insect bites. Some households kept it as a general tonic, which is where the "cure-for-all" tag came from.
The plant also spread as a weed of roadsides and old fields. That made it cheap and easy to find, which helped keep it in use.
This page describes what was done in the past. It is not a suggestion that you do the same.
Stop and get emergency help if you have hives, swelling of the face, lips or tongue, or trouble breathing.
Stop and see a doctor the same week if you notice yellow skin or eyes, dark urine, or pain in the upper right belly.
See a doctor rather than carrying on with the tea if you have a cough lasting more than three weeks, a fever over 38.5 C, chest pain, blood in your phlegm, or a wound that is red, hot and spreading.
Siguapate is not approved as a medicine in the United States, the United Kingdom or the European Union. In the United States it may be sold as a dietary supplement, which means it is not checked by the FDA for safety or effect before sale.
In Honduras, Guatemala, Cuba and nearby countries it is sold openly as a herb in markets and herb shops.
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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