Amber touch-and-heal, balm-of-warrior's wound, balsana, bassant, Blutkraut, bossant, Calmigen©, corancillo dendlu, devil's scorge, Eisenblut, flor de S©o Jo©o, fuga daemonum, goatweed hartheu, heofarigo on, herba de millepertius, herba hyperici, herrgottsblut, hexenkraut, hierba de San Juan, hiperic©o, hip©rico, hipericon, HP, isorhamnetin, Jarsin, Johanniskraut, klammath weed, Liebeskraut LI 160, lord God's wonder plant, millepertius pelicao, perforate, pinillo de oro, PM235, pseudohypericin, rosin rose, SJW extract LI 160, St. John's wort WS 5572, STW 3-VI, tenturotou, Teufelsflucht, touch and heal, Walpurgiskraut (German), witcher's herb, WS 5572.
Extracts of Hypericum perforatum L. (St. John's wort) have been recommended traditionally for a wide range of medical conditions. The most common modern-day use of St. John's wort is the treatment of depression. Numerous studies report St. John's wort to be more effective than placebo and equally effective as tricyclic antidepressant drugs in the short-term treatment of mild-to-moderate major depression (1-3 months). It is not clear if St. John's wort is as effective as selective serotonin reuptake inhibitor (SSRI) antidepressants such as sertraline (Zoloft©).
Recently, controversy has been raised by two high-quality trials of St. John's wort for major depression that did not show any benefits. However, due to problems with the designs of these studies, they cannot be considered definitive. Overall, the scientific evidence supports the effectiveness of St. John's wort in mild-to-moderate major depression. The evidence in severe major depression remains unclear.
St. John's wort can cause many serious interactions with prescription drugs, herbs, or supplements. Therefore, people using any medications should consult their healthcare providers including their pharmacist prior to starting therapy.
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.
Depressive disorder (mild-to-moderate)
St. John's wort has been extensively studied in Europe over the last two decades, with more recent research in the United States. Short-term studies (1-3 months) suggest that St. John's wort is more effective than placebo (sugar pill), and equally effective as tricyclic antidepressants (TCAs) in the treatment of mild-to-moderate major depression. Comparisons to the more commonly prescribed selective serotonin reuptake inhibitor (SSRI) antidepressants, such as fluoxetine (Prozac©) or sertraline (Zoloft©), are more limited. However, other data suggest that St. John's wort may be just as effective as SSRIs with fewer side effects. Safety concerns exist as with most conventional and complementary therapies.
Somatoform disorders show physical symptoms that cannot be attributed to organic disease and appear to be of psychic origin. Early evidence shows that St. John's wort may help with somatoform disorders. Further research is needed to confirm these results.
Overall, there is currently not enough evidence to recommend St. John's wort for the primary treatment of anxiety disorders.
Early study of hypericum-cream in the topical treatment of mild to moderate atopic dermatitis shows positive results. Further studies are needed before a firm recommendation can be made.
Attention deficit hyperactivity disorder (ADHD) (children)
It is unclear whether St. John's wort is an effective treatment in children with ADHD. More study is needed to confirm these findings.
There is not enough evidence to determine if St. John's wort is an effective treatment for depression in children younger than 18 years of age.
Early study shows that St. John's wort may help neuropathic (nerve) pain. Further research is needed to confirm these results.
Obsessive-compulsive disorder (OCD)
There are a few reported cases of possible benefits of St. John's wort in patients with obsessive-compulsive disorder (OCD). Currently there is not enough scientific evidence to recommend St. John's wort for this condition.
Pain (burning mouth syndrome)
It is unclear whether St. John's wort is an effective treatment for pain associated with burning mouth syndrome. More study is needed.
Pain relief (after surgery)
It is unclear whether St. John's wort is an effective treatment for pain after surgery. More study is needed.
There is currently not enough scientific evidence to recommend St. John's wort for this indication.
Premenstrual syndrome (PMS)
Further studies are needed before a strong recommendation can be made.
Seasonal affective disorder (SAD)
Despite some promising early data, there is currently not enough evidence to recommend St. John's wort for depressive disorder with seasonal pattern or Seasonal Affective Disorder (SAD).
Results of early study on the efficacy of St. John's wort in social phobia are unclear. More study is needed.
Depressive disorder (severe)
Studies of St. John's wort for severe depression have not provided clear evidence of effectiveness.
Human immunodeficiency virus (HIV)
Anti-viral effects of St. John's wort have been observed in laboratory studies, but were not found in one human study. Multiple reports of significant adverse effects and interactions with drugs used for HIV/AIDS, including protease inhibitors (PIs) and non-nucleoside reverse transcriptase inhibitors (NNRTIs), suggest that patients being treated for HIV/AIDS should avoid this herb. Therefore, there is evidence to recommend against using St. John's wort in the treatment of patients with HIV/AIDS.
*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. Abdominal discomfort or irritation, abrasions (topical), alcoholism, allergies, anti-inflammatory, anti-malarial, antioxidant, antiviral, asthma, athletic performance enhancement, bacterial skin infections (topical), bedwetting, benzodiazepine withdrawal, bruises (topical), burns (topical), cancer, chronic bowel irritation, chronic ear infections, colitis, contusions, dental pain, diarrhea, diuretic (increasing urine flow), dyspepsia, Epstein-Barr virus infection, fatigue, glioma (brain tumor), heartburn, hemorrhoids, herpes virus infection, hypnotic, immune function, influenza, insomnia, joint pain, liver protection from toxins, malaria treatment, menstrual pain, mood disorders (menopause), nicotine withdrawal, rheumatism, skin scrapes, sleep, snakebites, sprains, substance abuse, ulcers, weight loss, wound healing (topical).
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 (over 18 years old)
Clinical trials have used a range of doses, including 0.17-2.7 milligrams of hypericin by mouth, and 900-1,800 milligrams of St. John's wort extract daily by mouth.
1.5% hyperforin (verum) has been applied to the skin for the treatment of atopic dermatitis.
Children (under 18 years old)
Clinical trials have used 150-1,800 milligrams of St. John's wort extract daily by mouth with good tolerability.
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.
Infrequent allergic skin reactions, including rash and itching, are reported in human studies.
Side Effects and Warnings
In published studies, St. John's wort has generally been well tolerated at recommended doses for up to 1-3 months. The most common adverse effects include gastrointestinal upset, skin reactions, fatigue/sedation, restlessness or anxiety, sexual dysfunction (including impotence), sensitivity to light, dizziness, headache, and dry mouth. Several recent studies suggest that side effects occur in one to three percent of patients taking St. John's wort, and that the number of adverse events may be similar to placebo (and less than standard antidepressant drugs). Animal toxicity studies have found only non-specific symptoms such as weight loss. One small study reported elevated thyroid stimulating hormone (TSH) levels to be associated with taking St. John's wort.
It has been reported that St. John's wort may cause psychiatric symptoms such as suicidal and homicidal thoughts.
Delayed ejaculation has been reported in animal studies.
Pregnancy and Breastfeeding
There is not enough scientific evidence available to recommend use during pregnancy or breastfeeding.
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
St. John's wort interferes with the way the body processes many drugs using the liver's "cytochrome P450" enzyme system. As a result, the levels of these drugs may be increased in the blood in the short-term (causing increased effects or potentially serious adverse reactions) and/or decreased in the blood in the long-term (which can reduce the intended effects). Examples of medications that may be affected by St. John's wort in this manner include carbamazepine, cyclosporin, irinotecan, midazolam, nifedipine, simvastatin, theophylline, warfarin, or HIV drugs such as non-nucleoside reverse transcriptase inhibitors (NNRTIs) or protease inhibitors (PIs). The U.S. Food & Drug Administration (FDA) suggests that patients with HIV/AIDS on protease inhibitors or non-nucleoside reverse transcriptase inhibitors avoid taking St. John's wort.
Taking St. John's wort with antidepressants may lead to increased side effects, including serotonin syndrome and mania. Serotonin syndrome is a condition defined by muscle rigidity, fever, confusion, increased blood pressure and heart rate, and coma. Mania is defined by symptoms of elevated or irritable mood, rapid speech or thoughts, increased activity, and decreased need for sleep. Using St. John's wort with MAOIs may also increase the risk of severely increased blood pressure. Caution is also advised when using St. John's wort with tricyclic antidepressants.
Reports exist of altered menstrual flow, bleeding, and unwanted pregnancies in women taking birth control pills and St. John's wort at the same time. Although cases of interaction are rare, caution is advised when taking St. John's wort and coumarin-type anticoagulants (blood thinners). In general, individuals should check the package insert and speak with a qualified healthcare professional including a pharmacist about possible interactions with St. John's wort.
St. John's wort may lead to increased risk of sun sensitivity when taken with other drugs such as antibiotics or birth control pills. A possible interaction with loperamide (Imodium©) has been reported; confusion and agitation occurred in one patient taking St. John's wort, loperamide, and the herb valerian (Valeriana officinalis). St. John's wort may interact with triptan-type headache medications. Examples include naratriptan (Amerge©), rizatriptan (Maxalt©), sumatriptan (Imitrex©), and zolmitriptan (Zomig©). In theory, St. John's wort may also interact with certain chemotherapy drugs such as anthracyclines. St. John's wort may increase the anti-inflammatory effects of COX2 inhibitor drugs or NSAIDS like ibuprofen (Motrin©).
St John's wort may increase imatinib clearance. Thus, patients taking imatinib should avoid taking St John's wort. Concomitant use of enzyme inducers, including St John's wort, may necessitate an increase in the imatinib dose to maintain effectiveness.
In higher doses, St. John's wort has been shown to decrease the blood concentrations of omeprazole, tolbutamide, caffeine, dextromethorphan, fexofenadine, carbamazepine, and cimetidine, among other medications. No relevant interaction has been seen with alprazolam, caffeine, tolbutamide, and digoxin by treatment with a low-hyperforin St. John's wort extract.
Caution is also advised when taking benzodiazepine tranquilizers, opioids, P-glycoprotein regulated drugs, antibiotics, antivirals, anesthetics, antifungals, sedatives, or drugs used for anxiety, heart problems, or seizures. In general, individuals should check the package insert and speak with a qualified healthcare professional including a pharmacist about possible interactions with St. John's wort.
Interactions with Herbs and Dietary Supplements
St. John's wort may interfere with the way the body processes certain herbs and supplements using the liver's "cytochrome P450" enzyme system. As a result, the levels of these drugs may be increased in the blood in the short-term, causing increased effects or potentially serious adverse reactions, or decreased in the blood in the long-term, which can reduce the intended effects.
Taking St. John's wort with herbs or supplements with antidepressant activity may lead to increased side effects, including serotonin syndrome, mania, or severe increase in blood pressure. There is a particular risk of these interactions occurring with agents that possess possible monoamine oxidase inhibitory properties.
St. John's wort may lead to increased risk of sun sensitivity when taken with capsaicin or other photosensitizing products. St. John's wort may interact with herbs that also possess cardiac glycoside properties and decrease blood levels.
A possible interaction with the herb valerian (Valeriana officinalis) has been reported; confusion and agitation occurred in one patient taking St. John's wort, loperamide (Immodium©) and valerian. However, St. John's wort and valerian are often used together, with few reported of adverse events. In theory, due to the presence of tannins, St. John's wort may inhibit the absorption of iron.
Although cases of interaction are rare, caution is advised when taking St. John's wort and herbs and supplements that may have blood-thinning effects.
Caution is also advised when taking red yeast rice or any herb or supplements that is P-glycoprotein regulated. In general, individuals should speak with a qualified healthcare professional, including a pharmacist, about possible interactions with St. John's wort.
Use cautiously when combining St. John's wort with herbs or supplements that have the following proposed effects: antibacterial, antiviral, or sedative. Also, St. John's wort may have a possible interaction with herbs or supplements used for anxiety, heart problems, or seizures.
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)