# Plant Monograph: Cramp Bark
**Name of plant:**
Cramp Bark
**Catch phrase (Carmina Gadelica or traditional invocation if available):**
No specific invocation from the *Carmina Gadelica* is recorded for Cramp Bark. In North American herbal tradition, it became known as "the muscle relaxer of the woods," valued for easing spasms, cramps, and tension throughout the body.
**Family:**
Adoxaceae
(formerly classified in Caprifoliaceae)
**Genus and species:**
*Viburnum opulus* L. var. *americanum* Aiton
(Synonyms: *Viburnum trilobum*, American Cranberrybush)
**Other names:**
Cramp Bark, American Cranberrybush, Highbush Cranberry, Guelder Rose (European relative), Snowball Tree, Squaw Bush (historical name), Viburnum Bark
**Brief introduction:**
Cramp Bark is a deciduous shrub native to North America and parts of Europe. It is known for its clusters of white flowers, bright red berries, and medicinal bark. The bark, harvested primarily from young stems, has a long history of use among Indigenous peoples, Eclectic physicians, and Western herbalists as a remedy for muscular tension, menstrual cramps, and smooth muscle spasms. It remains one of the most respected antispasmodic herbs in North American herbal medicine.
**Traditional uses:**
* Relief of menstrual cramps
* Treatment of muscle spasms
* Support for uterine discomfort
* Traditional remedy for nervous tension
* Relief of digestive cramping
**Historical use:**
* Used by Indigenous peoples of North America for cramps and pain
* Adopted by Eclectic physicians during the nineteenth century
* Included in traditional remedies for dysmenorrhea
* Used for muscle cramps associated with physical labor
* Employed as a general antispasmodic herb
**Parts used and method of use:**
* Stem bark
* Root bark (occasionally)
Used as:
* Decoction
* Tincture
* Fluid extract
* Powdered bark
**Use in healing (modern herbal practice):**
* Support for menstrual cramping
* Relief of skeletal muscle tension
* Adjunctive support for digestive spasms
* Traditional support for tension headaches associated with muscle tightness
* General antispasmodic herb for smooth and skeletal muscle discomfort
**Pharmacology and biochemistry:**
* Valerenic acid-like compounds (historically attributed viburnine complex)
* Coumarins
* Flavonoids
Mechanisms:
* Antispasmodic constituents may reduce smooth muscle contraction
* Coumarins may contribute mild relaxant effects
* Flavonoids provide antioxidant and anti-inflammatory activity
**Overall profile:**
Cramp Bark is considered one of the premier antispasmodic herbs in Western herbal medicine. Its primary use is the relief of involuntary muscle tension and cramping, particularly involving the uterus, digestive tract, and skeletal muscles. Modern evidence is limited but generally supports its traditional role as a muscle relaxant.
**Common dosage:**
* Decoction: 2–4 g dried bark per cup, up to 3 times daily
* Tincture (1:5): 2–5 mL, up to 3 times daily
* Fluid extract: 1–2 mL, up to 3 times daily
* Powdered bark: 1–2 g daily
**Safety factors (including side effects):**
* Generally regarded as safe when used appropriately
* Excessive doses may cause mild digestive upset
* May cause mild drowsiness in sensitive individuals
* Use during pregnancy should be guided by a qualified practitioner
* Long-term traditional use demonstrates a favorable safety profile
**First aid / adverse reaction response:**
* Mild nausea: reduce dosage or discontinue use
* Excessive sedation: discontinue use and monitor symptoms
* Allergic reaction: discontinue use and seek medical advice
* Severe allergic reaction: seek immediate medical attention
**Drug interactions:**
* Theoretical additive effects with sedative medications
* Theoretical interaction with antispasmodic drugs
* Potential additive effects with muscle relaxants
* Individuals taking prescription medications should consult a qualified healthcare practitioner before therapeutic use
**Horticultural requirements:**
* USDA / Canadian zone: Zones 2–8
* Soil pH: 5.5–7.5
* Light requirements: Full sun to partial shade
* Moisture: Moderate moisture; prefers well-drained soils
* Other notes (growth habit, harvest timing, etc.):
* Deciduous shrub growing 2–5 metres tall
* Produces white flower clusters in late spring
* Bright red berries mature in late summer and autumn
* Bark is harvested from young branches in spring or autumn
* Found in woodland margins, riverbanks, and moist thickets
**Sampling of clinical reports / studies:**
* Limited human clinical studies support traditional antispasmodic applications
* Pharmacological research demonstrates smooth muscle relaxant activity in laboratory models
* Phytochemical investigations identify coumarins, flavonoids, tannins, and related compounds
* Ethnobotanical evidence documents extensive use among Indigenous North American peoples and nineteenth-century Eclectic physicians
* Overall assessment of evidence: Traditional support is exceptionally strong for menstrual and muscular cramping. Modern pharmacological findings support antispasmodic activity, although large-scale clinical studies remain limited.
Educational Use Only: The information presented on this page is provided for educational, historical, and informational purposes only. ArdNemeton na Tuatha and Bhùth Draoi do not provide medical advice. Always consult your physician and pharmacist before using any herb, mushroom, supplement, or botanical product for medicinal purposes. Traditional uses described herein do not constitute medical claims.