Research
Couch grass for Bladder Health: Evidence, Interactions and Cautions
Couch grass is an ingredient used in bladder supplements marketed to women. Below is what it has actually been studied for, how strong that evidence is, the drug interactions and cautions on record, and the primary source our grade rests on — all drawn from the HerWellReport ingredient dataset.
Also sold as: Elymus repens; Agropyron repens; Elytrigia repens; Graminis rhizoma; twitch grass
What the evidence says about Couch grass
Registered by the EMA on traditional use only. Its assessment report states there are no data available from controlled clinical studies. The two human reports it found were an open trial in 99 patients and a post-marketing study of 313 patients, neither with a control group, with symptom-free rates of 32% to 53% in the second. The assessors concluded the quality of these studies could not be evaluated, so the uncontrolled improvement figures cannot be attributed to the herb.
The grade "traditional" means: traditional — A long history of use but little or no human trial evidence for this outcome. Grades are explained in full on our methodology page.
Read the primary source this grade rests on (opens in a new tab).
Couch grass drug interactions
No documented drug interactions in the sources we checked. That is not the same as proof of safety alongside your medication — it usually means the question has not been studied. Ask a pharmacist before combining it with prescription drugs.
Who should be careful with Couch grass
- Not in severe kidney or heart disease, because of a risk of low potassium
- Not in pregnancy or breastfeeding
- Keep fluid intake up while taking it
- Use for 2 to 4 weeks only
Read more on HerWellReport
This entry is generated from row "Couch grass" of the HerWellReport ingredient dataset (v2.1, updated 2026-09-23). The dataset is free to reuse under CC BY 4.0 — how to cite it. Ingredient evidence is not evidence for any finished product, and nothing here is medical advice.