Blatterdock, bog rhubarb, bogshorns, butcher's rhubarb, butterbur coltsfoot, butterburr, butter-dock, butterdock, butterfly dock, capdockin, coughwort, donnhove, European pestroot, exwort, flapper-bags, flapperdock, fuki, horsehoof, langwort, paddy's rhubarb, pestwurz, Petadolex©, Petadolor H, Petaforce©, petasites, petasites flower, petasites leaf, petasites rhizome, Petasitidis hybridus, Petasites officinalis, Petasites ovatus, Petasites vulgaris, petasitidis folium (flower), petasitidis rhizoma (rhizome), plaguewort, purple butterbur, sweet coltsfoot, Tesalin©, Tussilago farfara, Tussilago hybrida, Tussilago petasites, umbrella leaves, umbrella plant, western coltsfoot, wild rhubarb, ZE 339.
Butterbur is a perennial shrub, found throughout Europe as well as parts of Asia and North America. It is usually found in wet, marshy ground, in damp forests, and adjacent to rivers or streams. The leaves of the plant are responsible for its botanical and common names. The common name is attributed to the large leaves being used to wrap butter during warm weather.
Butterbur has been traditionally used as an antispasmodic and analgesic (pain reliever), specifically for conditions afflicting the stomach, bile ducts, and duodenum (part of small intestine). Butterbur is believed to help strengthen digestion and improve obstructed bile flow. Butterbur has also been given for inflammation of the urinary tract and cramps. There is compelling initial evidence from human trials to suggest benefits in prevention of migraine headache. Evidence in support of use for allergic rhinitis prevention is also promising. Benefits have not been demonstrated scientifically for any other condition.
Use should be limited to commercially available products free of pyrrolizidine alkaloids that are generally believed to be well-tolerated.
These uses have been tested in humans or animals. Safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider.
Allergic rhinitis prevention
Comparisons of butterbur to prescription drugs such as fexofenadine (Allegra©) and cetirizine (Zyrtec©) have reported similar efficacy. These results suggest benefits of butterbur for prevention of allergic rhinitis. Additional study is warranted before a strong recommendation can be made.
Pain relief and headache prevention are traditional uses of butterbur. Current, available evidence is compelling enough to suggest benefits of butterbur for migraine prevention, although additional evidence is necessary before a strong recommendation can be made. Comparisons to other agents used for this purpose such as beta-blockers or feverfew have not been conducted.
Allergic skin disease
There is limited human evidence in this area, although preliminary research suggests that butterbur may not suppress allergic skin reactions when compared to the prescription drug fexofenadine (Allegra©), which does suppress these reactions. Additional study is needed.
Butterbur was used historically to treat asthma, and initial human research suggests possible benefits. However, additional study is needed to make a firm recommendation.
*Key to grades:
A: Strong scientific evidence for this use;
B: Good scientific evidence for this use;
C: Unclear scientific evidence for this use;
D: Fair scientific evidence against this use (it may not work);
F: Strong scientific evidence against this use (it likely does not work).
The below uses are based on tradition, scientific theories, or limited research. They often have not been thoroughly tested in humans, and safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider. There may be other proposed uses that are not listed below. Antispasmodic, anxiety, appetite stimulant, cardiovascular conditions, chills, chronic cough, colds, cramps, diuretic (increases urine flow), fever, gastric ulcers, headache treatment, indigestion, insomnia, irritable bladder, ocular allergy, pain, plague, urinary complaints, urinary tract spasm, whooping cough, wound/skin healing.
The below doses are based on scientific research, publications, traditional use, or expert opinion. Many herbs and supplements have not been thoroughly tested, and safety and effectiveness may not be proven. Brands may be made differently, with variable ingredients, even within the same brand. The below doses may not apply to all products. You should read product labels, and discuss doses with a qualified healthcare provider before starting therapy.
Adults (18 years and older)
Studies have reported safety and good tolerability of commercially available butterbur products (which are free of potentially carcinogenic pyrrolizidine alkaloid constituents), when used orally in recommended doses for up to 12-16 weeks.
For allergic rhinitis, 50 milligrams of standardized butterbur (Petadolex©, standardized to contain 7.5 milligrams of petasin and isopetasin per 50-milligrams tablet) has been used twice daily. A large study used one tablet of carbon dioxide extract standardized to 8.0 milligrams of total petasin per tablet (Tesalin©), taken four times daily, while a smaller study reported that 2 standardized tablets taken three times daily was effective.
Dosing for asthma is undefined due to a lack of evidence. However, 50 milligrams of standardized butterbur (Petaforce©), administered in two divided daily doses, in patients maintained on inhaled corticosteroids has been used. Petadolex© 150 milligrams daily in three divided daily doses for 2-4 months has also been studied.
For migraine prophylaxis, 50-75 milligrams Petadolex© twice daily for up to four months has been studied. One study suggested that the 75-milligram dose but not the 50-milligram dose is effective.
Children (younger than 18 years)
For asthma, 50-150 milligrams daily (depending on age) of a pyrrolizidine-free butterbur rhizome extract standardized to 7.5 milligrams of petasin and isopetasin per 50-milligram tablet (Petadolex©) may be effective. However, due to a lack of safety and efficacy data, butterbur cannot be recommended for this or any other use in children at this time.
The U.S. Food and Drug Administration does not strictly regulate herbs and supplements. There is no guarantee of strength, purity or safety of products, and effects may vary. You should always read product labels. If you have a medical condition, or are taking other drugs, herbs, or supplements, you should speak with a qualified healthcare provider before starting a new therapy. Consult a healthcare provider immediately if you experience side effects.
Avoid in individuals with a known allergy or hypersensitivity to Petasites hybridus or other plants from the Asteraceae/Compositae family such as ragweed, marigolds, daisies, and chrysanthemums.
Side Effects and Warnings
Studies have reported safety and good tolerability of commercially available butterbur products (which are free of potentially carcinogenic pyrrolizidine alkaloid constituents), when used orally in recommended doses short-term. Raw, unprocessed butterbur plant should not be ingested due to the potential hepatotoxicity (liver damaging) of pyrrolizidine alkaloids with long-term use (specifically, concern of veno-occlusive disease). This includes any teas, capsules of raw herb, or unprocessed tinctures or extracts. Use should be limited to commercially available products that are free of pyrrolizidine alkaloids. The plant's pyrrolizidine alkaloids are also thought to be carcinogenic (cancer causing), mutagenic, and nephrotoxic (kidney damaging).
When taken by mouth, butterbur may cause headache, drowsiness, fatigue, itchy eyes, eye discoloration, breathing difficulties, skin discoloration or pruritis (severe itching).
Butterbur taken by mouth may also cause sustained constipation, discoloration of stool, dysphagia (difficulty swallowing), severe nausea, vomiting, diarrhea, or stomach upset. Butterbur may increase liver enzyme levels.
Pregnancy and Breastfeeding
Butterbur (Petasites hybridus) is not recommended in women who are pregnant or breastfeeding due to a lack of safety studies.
Most herbs and supplements have not been thoroughly tested for interactions with other herbs, supplements, drugs, or foods. The interactions listed below are based on reports in scientific publications, laboratory experiments, or traditional use. You should always read product labels. If you have a medical condition, or are taking other drugs, herbs, or supplements, you should speak with a qualified healthcare provider before starting a new therapy.
Interactions with Drugs
Administration of butterbur with anticholinergics may not be advisable. Numerous drugs and drug classes may interact with anticholinergic agents. Examples include: acetophenenazine, amantadine, amitriptyline, atropine, benztropine, bethanechol, biperiden, brompheniramine, carbinoxamine, chlorpromazine, clemastine, clindinium, clozapine, cyclopentolate, cyproheptadine, dicyclomine, diphenhydramine, dixyrazine, ethopropazine, fenotherol, fluphenazine, haloperidol, homatropine, hyosciamine, ipratropium, loxapine, mesoridazine, methdilazine, methotrimeprazine, olanzapine, oxybutynin, perazine, periciazine, perphenazine, pimozide, pipotiazine, prochlorperazine, procyclidine, promazine, promethazine, propiomazine, quinidine, scopolamine, thiethylperazine, thioridazine, thiothixene, trifluoperazine, triflupromazine, trihexyphenidyl, trimeprazine, triprolidine. Consult with a qualified healthcare professional, including a pharmacist, before taking butterbur preparations.
Interactions with Herbs and Dietary Supplements
Raw, unprocessed butterbur may contain toxic pyrrolizidine alkaloids, although commercially available products should be free of pyrrolizidine alkaloids. Nonetheless, concomitant use of other agents containing pyrrolizidine alkaloids should be avoided due to the potential for additive toxicity.
Combination use with anticholinergic agents may potentiate therapeutic and adverse effects. Examples of anticholinergic herbs include belladonna, bittersweet (Solanum dulcamara), henbane (Hyoscyamus niger), and Jimson weed (Datura stramonium).
This information is based on a systematic review of scientific literature edited and peer-reviewed by contributors to the Natural Standard Research Collaboration (www.naturalstandard.com).
Natural Standard Bottom Line Monograph, Copyright © 2011 (www.naturalstandard.com). Commercial distribution prohibited. This monograph is intended for informational purposes only, and should not be interpreted as specific medical advice. You should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.
While some complementary and alternative techniques have been studied scientifically, high-quality data regarding safety, effectiveness, and mechanism of action are limited or controversial for most therapies. Whenever possible, it is recommended that practitioners be licensed by a recognized professional organization that adheres to clearly published standards. In addition, before starting a new technique or engaging a practitioner, it is recommended that patients speak with their primary healthcare provider(s). Potential benefits, risks (including financial costs), and alternatives should be carefully considered. The below monograph is designed to provide historical background and an overview of clinically-oriented research, and neither advocates for or against the use of a particular therapy.
The information in this monograph is intended for informational purposes only, and is meant to help users better understand health concerns. Information is based on review of scientific research data, historical practice patterns, and clinical experience. This information should not be interpreted as specific medical advice. Users should consult with a qualified healthcare provider for specific questions regarding therapies, diagnosis and/or health conditions, prior to making therapeutic decisions.
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Copyright © 2011 Natural Standard (www.naturalstandard.com)
Copyright © 2011 Natural Standard (www.naturalstandard.com)