Motherwort
Leonurus cardiaca
A traditional European heart-and-nerve herb used for palpitations with anxiety, nervous tension, and menstrual and menopausal complaints; its Latin name means 'lion-hearted', but modern clinical evidence is sparse.
At a Glance
- Best known for
- Calms palpitations and a racing heart linked to anxiety, Mild sedative and anxiolytic effect, Traditional support for menstrual cramps and menopausal symptoms
- Evidence
- Preliminary
- Typical dose
- 2–4 mL 1:5 tincture 2–3x daily
- Type
- Herb
What is Motherwort?
Motherwort (Leonurus cardiaca) is a tall, bushy perennial of the mint family native to central Asia and southeastern Europe and naturalized throughout the temperate world. Its names reflect its two traditional roles: 'motherwort' for use in childbirth, menstrual problems, and 'female weakness', and 'cardiaca' (and Chinese yi mu cao in the related species Leonurus japonicus) for heart complaints. The 17th-century herbalist Culpeper wrote that there was 'no better herb to drive melancholy vapours from the heart'. It is approved by the German Commission E for nervous cardiac conditions such as palpitations and as an adjunct in hyperthyroidism, and it remains a favorite of Western herbalists for anxiety felt in the chest.
Known Health Benefits
How It Works
Motherwort's cardiac effects are attributed mainly to leonurine and lavandulifolioside, which in animal and isolated-tissue studies slow heart rate, reduce the force of contraction mildly, prolong the refractory period (an antiarrhythmic action), and dilate coronary and peripheral vessels, lowering blood pressure. Leonurine also has antioxidant and anti-platelet effects. The herb's sedative action involves GABAergic modulation and is enhanced by its flavonoids; animal studies show reduced anxiety-like behavior. Stachydrine and leonurine act on uterine muscle, increasing tone and rhythmic contraction, which underlies the traditional obstetric and menstrual uses and the cautions in pregnancy. Iridoids and diterpenes contribute mild anti-inflammatory activity.
What Research Says
Human studies are few and small. A 2011 Russian open-label study of 50 people with mild hypertension accompanied by anxiety and sleep disturbance found a motherwort oil extract (300 mg twice daily for 28 days) produced significant improvement in anxiety and sleep in about 80% of participants, with a modest reduction in blood pressure, but it lacked a placebo group. Older German and Russian reports describe benefit in nervous palpitations and menopausal complaints, but they do not meet modern trial standards. Pharmacological studies have confirmed antiarrhythmic, hypotensive, and sedative effects in animals and isolated hearts, and a 2013 review in Phytotherapy Research summarized the phytochemistry and these effects while noting the absence of controlled clinical trials. The related species Leonurus japonicus has been studied in China for postpartum uterine recovery. Motherwort's use therefore rests on tradition, regulatory acceptance in Germany, and plausible pharmacology rather than trial evidence.
Active Compounds
Alkaloids (leonurine, stachydrine), iridoids (leonuride, ajugoside), diterpenes (leocardin), flavonoids (rutin, quercetin, apigenin), phenylpropanoids (lavandulifolioside), tannins
Forms & Bioavailability
Alkaloids such as leonurine and stachydrine are water- and alcohol-soluble and absorbed orally, with effects reported within 30–60 minutes in traditional use. The herb's intense bitterness makes tea unpopular; tinctures are the preferred form. Standardization is uncommon, and alkaloid content varies with harvest time (highest at flowering).
Dosage Guidance
| Use Case | Dosage |
|---|---|
| Palpitations with anxiety | 2–4 mL 1:5 tincture 2–3x daily |
| Nervous tension / mild anxiety | 1–2 g dried herb as tea 2–3x daily |
| Menstrual cramps / delayed menses | 2–3 mL tincture 3x daily during menses |
| Menopausal palpitations and hot flashes | 2 mL tincture 2–3x daily |
| Mild hypertension with anxiety (adjunct) | 300 mg extract 2x daily |
Always consult a healthcare provider for personalized dosing.
Natural Food Sources
- Not found in food; used medicinally only
- Occasionally brewed as a bitter tea
Potential Side Effects
Drowsiness, stomach upset; uterine stimulation; increased menstrual bleeding; photosensitivity and contact dermatitis reported; rare allergic reactions
Who Should Avoid It
- Pregnancy (uterine stimulant — traditionally used only at term under supervision)
- Heavy menstrual bleeding or bleeding disorders (may increase flow; antiplatelet effects)
- Concurrent sedatives, beta-blockers, or antiarrhythmics without supervision
- Scheduled surgery (stop 2 weeks before; bleeding and sedation)
- Undiagnosed palpitations or arrhythmia (must be evaluated medically first)
Pregnancy & Lactation
Contraindicated during pregnancy because of its uterine-stimulating alkaloids, except where used by trained midwives at term. There are no safety data for breastfeeding; traditional sources describe use for postpartum anxiety and uterine recovery, but modern guidance is to avoid it or use only under professional supervision.
Known Drug Interactions
Additive sedation with sedatives and alcohol; may add to antihypertensives and antiarrhythmics (bradycardia/hypotension); theoretical additive effect with anticoagulants and antiplatelets; may interact with thyroid medication (traditional use in hyperthyroidism)
Evidence Classification
Based on in vitro studies, animal models, pilot trials, or traditional use documentation. Clinical evidence is limited.
Frequently Asked Questions
Can motherwort treat heart palpitations?
Herbalists use it specifically for palpitations driven by anxiety or stress, where the heart is structurally normal, and animal studies support a mild calming and rate-steadying effect. It is not a treatment for diagnosed arrhythmias such as atrial fibrillation, and any new or persistent palpitations need medical evaluation before using herbs. If a doctor has confirmed the heart is healthy, motherwort can be a reasonable supportive option.
Why is it called motherwort if it affects the heart?
It was used in both roles for centuries: as a uterine tonic for menstrual cramps, delayed periods, and postpartum recovery, and as a heart remedy for 'nervous heart'. The species name cardiaca reflects the heart use; the common name reflects the obstetric use. The same alkaloids act on both uterine and heart muscle.
How does it compare with hawthorn?
Hawthorn has much better evidence, including RCTs in heart failure, and acts mainly by strengthening heart contraction and improving coronary blood flow. Motherwort is more sedative and is chosen when anxiety, tension, or hormonal change is driving heart symptoms. The two are often combined.
Does motherwort help with hyperthyroidism?
The German Commission E lists it as a supportive herb for nervous symptoms of an overactive thyroid, such as palpitations and restlessness, alongside bugleweed and lemon balm. It does not lower thyroid hormone levels itself; it only eases symptoms. Hyperthyroidism requires medical treatment.
References
- Leonurus cardiaca L. (motherwort): a review of its phytochemistry and pharmacology. Wojtyniak K, Szymański M, Matławska I. Phytother Res (2013)
- Effect of Leonurus cardiaca oil extract in patients with arterial hypertension accompanied by anxiety and sleep disorders. Shikov AN, Pozharitskaya ON, Makarov VG, et al.. Phytother Res (2011)
- Assessment report on Leonurus cardiaca L., herba. European Medicines Agency, Committee on Herbal Medicinal Products (HMPC) (2010)
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