Ruda tea, brewed from the leaves of the rue plant (Ruta graveolens), has been used for centuries in Latin American, Indian, and Persian folk medicine primarily to ease digestive cramps, promote menstrual flow, and reduce inflammation. The plant contains over 230 active compounds, and small amounts brewed as tea do appear to have real biological effects. But ruda also carries serious risks, especially for pregnant women, making proper preparation and dosage essential.
Digestive Relief and Cramping
The most well-supported traditional use of ruda tea is as an antispasmodic for the digestive system. Compounds in the plant relax smooth muscle tissue in the intestines, which can ease stomach cramps, bloating, and gas. Two compounds in particular are responsible: one works similarly to papaverine (a known muscle relaxant), while the other is roughly 20 times more potent and stays active in the body much longer. These effects have been confirmed in isolated gut muscle tissue, and they occur at relatively low doses.
This is the use most aligned with how people traditionally drink ruda tea: a single cup to settle an upset stomach or relieve intestinal spasms after a heavy meal.
Menstrual Cycle Support
Ruda has a long history as an emmenagogue, meaning it stimulates blood flow to the uterus and can bring on a late or irregular period. In traditional Indian and Persian medicine, it has been used specifically for regulating the menstrual cycle. The tea promotes uterine contractions, which is why many women in Latin America use it when a period is delayed or scanty.
This same property is exactly what makes ruda dangerous during pregnancy. The uterine contractions it triggers can cause miscarriage. Ruda tea has been documented in medical case reports as a self-administered abortifacient, and poison control data from South America shows that women who used rue for this purpose experienced liver damage, kidney problems, and blood disorders at alarming rates. One documented case involved multiorgan failure requiring emergency dialysis. If there is any chance you are pregnant, ruda tea should be completely avoided.
Anti-Inflammatory Effects
Rue extracts reduce inflammation through a mechanism similar to common anti-inflammatory drugs. In laboratory studies on immune cells, rue extract suppressed the production of two key enzymes that drive inflammation: one that produces nitric oxide (a chemical that amplifies swelling and pain) and another called COX-2, the same enzyme targeted by ibuprofen and similar medications. The extract actually suppressed COX-2 more effectively than rutin, one of rue’s individual flavonoid compounds, suggesting that the whole plant works better than any single ingredient.
This anti-inflammatory action likely explains why ruda has traditionally been applied externally for joint and muscle pain. Homeopathic creams containing rue extract are marketed for temporary relief of arthritis pain, backaches, sprains, and joint stiffness.
Circulatory and Vascular Benefits
Ruda contains rutin, a flavonoid that strengthens capillary walls and reduces their fragility. Rutin has been found effective in treating varicose veins and hemorrhoids, and early clinical research showed it could normalize the increased capillary fragility associated with high blood pressure. This reduces the risk of small bleeds in the retina and brain. Rutin also has documented antioxidant, blood-pressure-lowering, and heart-protective properties.
The amount of rutin you get from a single cup of ruda tea is modest compared to supplement doses used in studies, but it contributes to the tea’s overall profile of vascular support.
How to Prepare Ruda Tea Safely
Traditional preparation calls for 1 teaspoon (2 to 3 grams) of dried rue leaves steeped in 1 liter of boiled water for 5 minutes. The water should be removed from heat before adding the leaves. Strain and drink no more than 1 cup per day.
That “no more than one cup” guideline matters. Ruda’s antispasmodic benefits appear at low doses, but higher amounts shift the plant from remedy to poison. Large quantities can cause vomiting, diarrhea, tremors, seizures, hemorrhage, a dangerously slow heart rate, and liver damage. Animal studies have confirmed dose-dependent liver toxicity even from standard herbal extracts, with liver enzyme levels rising as the dose increased.
Skin Sensitivity and Sun Exposure
Rue contains furanocoumarins, particularly psoralens, which are photoactive chemicals. If the plant’s juice or a strong tea contacts your skin and that skin is then exposed to sunlight, it can cause a painful reaction called phytophotodermatitis: redness, blistering, and dark patches of pigmentation that can last weeks or months. If you handle fresh rue leaves while preparing tea, wash your hands thoroughly and avoid sun exposure on any skin that made contact with the plant.
Who Should Avoid Ruda Tea
- Pregnant women: Ruda stimulates uterine contractions and has documented abortifacient effects, with cases of severe organ toxicity reported in women who used it to end pregnancies.
- People with liver or kidney conditions: Rue’s primary toxicity targets the liver and kidneys, so any existing impairment increases risk.
- Those on blood thinners: Rue contains coumarins that can interact with anticoagulant medications and increase bleeding risk.
- Children: There is no established safe dose for children, and the margin between a therapeutic and toxic amount is narrow even for adults.
For healthy adults using small amounts occasionally for digestive discomfort or menstrual support, ruda tea has a long track record in folk medicine. The key is respecting the dose: one teaspoon of dried leaves, one cup per day, and not as a daily habit over long periods.