Question 1

How does Leonurus japonicus work to regulate menstruation?

Accepted Answer

Leonurus japonicus contains alkaloids, particularly leonurine and stachydrine, which act as uterotonic agents. These compounds stimulate uterine smooth muscle contractions and promote blood flow to the pelvic region. The herb's mechanism involves improving microcirculation and reducing blood stasis, which explains its traditional use for regulating menstrual cycles and promoting postpartum uterine recovery. Evidence level: C (preclinical and traditional use data).

Question 2

Does Leonurus herb interact with any medications?

Accepted Answer

Leonurus japonicus may interact with anticoagulant and antiplatelet medications due to its blood-invigorating properties. Theoretically, combining it with warfarin, aspirin, or other blood thinners could increase bleeding risk. It may also potentiate the effects of uterine-stimulating medications. Limited clinical interaction data exists, so patients taking prescription medications should consult a healthcare provider before use. Evidence level: C (theoretical based on pharmacological activity).

Question 3

What is the recommended dosage for Leonurus japonicus?

Accepted Answer

The typical adult dosage of Leonurus japonicus is 9-30 grams of fresh herb or 6-12 grams of dried herb daily, prepared as a decoction. Dosage varies based on the condition being treated and whether fresh or dried material is used. In TCM practice, higher doses may be used for acute conditions. Standardized extracts are also available, though product-specific dosing should be followed. Evidence level: Traditional use recommendations.

Question 4

Is Leonurus safe to take during pregnancy?

Accepted Answer

No, Leonurus japonicus is contraindicated during pregnancy. The herb contains uterine-stimulating compounds (leonurine and stachydrine) that can cause uterine contractions and potentially trigger miscarriage or premature labor. Traditional Chinese Medicine classifies it as unsafe for pregnant women. However, it is commonly used postpartum to help the uterus return to normal size and reduce lochia. Women who are pregnant or trying to conceive should avoid this herb entirely.

Question 5

What is Leonurus herb used for in traditional medicine?

Accepted Answer

Leonurus japonicus (Yi Mu Cao) is a primary gynecological herb in Traditional Chinese Medicine, used primarily to invigorate blood circulation and regulate menstruation. It treats menstrual irregularities, dysmenorrhea (painful periods), and amenorrhea (absent periods). The herb also promotes urination and reduces edema, making it useful for water retention. Postpartum, it helps with uterine recovery and lochia discharge. Evidence level: C (traditional use with some preclinical support).

Question 6

What are the side effects of Leonurus japonicus?

Accepted Answer

Leonurus japonicus is generally well-tolerated at recommended doses. Reported side effects include mild gastrointestinal upset, such as nausea or stomach discomfort. Due to its uterine-stimulating effects, excessive doses may cause strong uterine contractions. The herb is contraindicated in cases of Yin deficiency without blood stasis, as it may worsen this pattern. Those with heavy menstrual bleeding should use caution. Evidence level: C (traditional use data and theoretical concerns).

Leonurus Herb

Sources & Citations

Prunus avium

Pata de Vaca

Alpinia zerumbet

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Safety & adverse effects

Pregnancy & lactation

Evidence summary

PubMed sources

Government sources