Essiac Tea by Mental Refreshment

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Acne. Although there is interest in using topical burdock for acne, there is insufficient reliable information about the clinical effects of burdock for this purpose.
• Aging skin. It is unclear if topical burdock is beneficial for reducing wrinkles. Details: A very small study in females aged 39-65 years shows that applying an emulsion containing burdock fruit extract 1.2% to the face twice daily for 4 weeks slightly reduces skin wrinkles around the eyes when compared with placebo (37420).
• Atopic dermatitis (eczema). Although there is interest in using topical burdock for eczema, there is insufficient reliable information about the clinical effects of burdock for this condition.
• Breast cancer. Oral burdock root has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Population research in breast cancer patients has found that using a specific product containing burdock root, sheep sorrel, slippery elm bark, and Indian rhubarb (Essiac, Resperin Canada Limited) is not associated with improved quality of life when compared with no intervention (37419).
• Common cold. Although there is interest in using oral burdock for symptoms of the common cold, there is insufficient reliable information about the clinical effects of burdock for this condition.
• Diabetes. Although there is interest in using oral burdock for diabetes, there is insufficient reliable information about the clinical effects of burdock for this condition.
• Diverticulitis. It is unclear if oral burdock is beneficial in patients with diverticulitis. Details: A small open-label clinical study in patients with colonic diverticulitis shows that taking burdock tea (Ajikan, Co., Ltd.) providing 1.5 grams three times daily for a median of 26 months is associated with an acute diverticulitis recurrence rate of 11%, compared with 32% of those not taking burdock tea. Furthermore, the recurrence-free duration was increased by about 14 months. However, taking burdock tea for a median of 16 months does not prevent colonic diverticular bleeding recurrence (102696).
• Dry skin. Although there is interest in using topical burdock for dry skin, there is insufficient reliable information about the clinical effects of burdock for this purpose.
• Gout. Although there is interest in using oral burdock for gout, there is insufficient reliable information about the clinical effects of burdock for this condition.
• Hepatitis. Although there is interest in using oral burdock for hepatitis, there is insufficient reliable information about the clinical effects of burdock for this condition.
• Metabolic syndrome. It is unclear if oral burdock is beneficial in patients with metabolic syndrome. Details: A very small clinical study in patients with metabolic syndrome shows that drinking burdock extract 100 mL three times daily after meals for 16 weeks does not reduce body weight, abdominal fat, blood pressure, lipid levels, or glucose when compared with baseline or control (105667).
• Obesity. Although there is interest in using oral burdock for obesity, there is insufficient reliable information about the clinical effects of burdock for this condition.
• Urinary tract infections (UTIs). Although there is interest in using oral burdock for UTI, there is insufficient reliable information about the clinical effects of burdock for this condition.
• Vaginitis. Topical burdock has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Observational research in adults and children with vaginitis has found that applying a specific solution containing burdock, chamomile, and aloe (Zelesse, ITF Research Pharma S.L.U., Alcobendas) to the vaginal area once or twice daily for 5-20 days is associated with moderate improvements in symptoms such as pruritus, erythema, and discharge when compared with baseline (102695,102697). The validity of this finding is limited by its observational nature and the lack of a control group. More evidence is needed to rate burdock for these uses.

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POSSIBLY EFFECTIVE

• Menopausal symptoms. Oral rhubarb root extract seems to help improve symptoms of menopause. Details: Clinical research in perimenopausal and postmenopausal patients shows that taking a specific dry extract of rhubarb root (ERr 731, Estroease, Lupin Pharmaceuticals) 4 mg orally daily for 3-27 months improves symptoms of menopause by 46% to 83% compared to an improvement of less than 20% with placebo. About 83% of females taking the rhubarb extract report overall clinical improvement, with specific improvements in anxiety, hot flushes, sweating, sleep, mood, quality of life, fatigue, sexual problems, urinary tract problems, vaginal dryness, and joint and muscle issues (92294,92295,92296,92297,92298,108960).
• Pancreatitis. Oral or rectal rhubarb might improve symptoms and duration of hospital stay in individuals with acute pancreatitis. It is unclear if oral rhubarb helps to prevent pancreatitis in individuals undergoing endoscopic retrograde cholangiopancreatography (ERCP). Details: Meta-analyses of clinical research in adults with acute pancreatitis in China shows that administering rhubarb 10-90 grams daily via gastric tube or rectal enema for 3-14 days, in combination with somatostatin, octreotide, or ulinastatin, reduces the risk for complications such as sepsis or kidney failure by 45%, duration of abdominal pain by 1.3-2 days, and duration of hospital stay by 6.7-6.9 days when compared with taking these medications alone (97922,100964). However, the included studies were of low methodological quality. Additionally, somatostatin and octreotide are not recommended for the treatment of acute pancreatitis by the American College of Gastroenterology or the American Gastroenterological Association (101001,100965). A separate meta-analysis and individual clinical studies show that administering rhubarb 6-20 grams 1-3 times daily for 5-14 days, usually via nasojejunal tube with early enteral nutrition, reduces the duration of hospital stay and improves abdominal symptoms when compared with enteral nutrition alone (92301,103475). The meta-analysis shows that administering rhubarb reduces hospital stay by 4.5 days and intensive care unit stay by 2.8 days. The use of rhubarb also reduced the duration of severe abdominal pain, abdominal distention, and abnormal bowel sounds by 1-2 days. However, there was no effect on mortality rate, infection rate, or the incidence of multiple organ dysfunction (103475). Rhubarb has also been studied for the prevention of pancreatitis in patients undergoing a specific procedure called endoscopic retrograde cholangiopancreatography (ERCP). Preliminary clinical research in patients at high risk for post-ERCP complications shows that drinking a raw rhubarb solution after the procedure reduces the incidence of post-ERCP pancreatitis by 74% and post-ERCP hyperamylasemia by 81% when compared to standard care. However, this study was of low methodological quality, and the rhubarb solution preparation and dose were not reported (97920).

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Acute respiratory distress syndrome (ARDS). It is unclear if oral rhubarb reduces ARDS. Details: A small clinical study in patients with ARDS shows that administering rhubarb leachate 10 grams in 30 mL water via nasogastric tube three times daily for 7 days, in addition to standard treatment, modestly improves oxygenation and reduces indices of pulmonary vascular permeability when compared with standard treatment (97921).
• Appendicitis. Oral rhubarb has only been evaluated in combination with other ingredients for use in pediatric appendiceal abscess; its effect when used alone is unclear. Details: A large observational study in children 3-14 years old with appendiceal abscess also receiving intravenous antibiotics suggests that taking a rhubarb peony decoction twice daily for 7-14 days is associated with a higher clinical cure rate of 93% when compared with 81% in the control group, but does not improve length of stay, post-operative complications, or recurrence rate (112380). However, it is unclear if the effects are from rhubarb, other ingredients, or the combination.
• Canker sores. Topical rhubarb has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: A small open-label clinical study in adults with mild canker sores shows that topical application of a specific combination product (Pyralvex Soluté, Laboratoires Norgine Pharma) containing rhubarb extract 5% and salicylic acid reduces the time to symptom resolution by about 3 days when compared to using a water control (97919).
• Chronic kidney disease (CKD). It is unclear if oral rhubarb prevents the progression of CKD or improves markers of kidney function. Details: A meta-analysis of results from two low-quality clinical studies shows that taking rhubarb 1-7.7 grams daily for up to 48 months as part of traditional Chinese medicine does not delay the onset of kidney failure when compared with standard treatment (92302). However, these results were calculated using regression analysis rather than long-term follow-up, which limits the validity of these findings. Another meta-analysis of clinical research shows that rhubarb may improve serum creatinine and blood urea nitrogen in patients with CKD when compared with no treatment (92302). However, rhubarb does not appear to improve blood urea nitrogen when compared with captopril (71329). The validity of the research to date is limited by the low to very low methodological quality of the studies and the high risk of bias. Additionally, all of the studies were conducted in China; it is unclear if these findings are applicable to other populations.
• Constipation. It is unclear if rhubarb is beneficial for constipation. Details: A small clinical study in middle-aged adults with constipation shows that taking rhubarb extract 12.5 mg or 25 mg based on rhein content (Gutisrheum, Laboratories Ortis) at bedtime for 1 month improves stool frequency and consistency when compared with placebo (112381). The validity of these findings is limited by patient-reported outcomes. A clinical study in patients with chronic constipation, defined as having a bowel movement no more than twice per week, shows that a specific combination product (Nucarb; Wilshire Laboratories Ltd) containing rhubarb extract 250 mg, activated charcoal 180 mg, calcium sennosides 50 mg, peppermint oil 0.5 mg, fennel oil 0.5 mg, and sulfur 50 mg, taken as two tablets at bedtime for one week, followed by 1 tablet at bedtime for 1 week, reduces passing gas, abdominal pain, and sensation of bloating by 81%, 73%, and 72% respectively, when compared with baseline. Sensation of straining, severity of constipation, and feeling of incomplete evacuation were reduced by 69%, 67%, and 54% respectively, when compared with baseline (108853). The validity of these findings is limited by the lack of a comparator group, and it is unclear whether the effects are due to rhubarb, the combination, or other ingredients.
• Dysmenorrhea. It is unclear if oral rhubarb reduces dysmenorrhea. Details: Preliminary clinical research in young adults with dysmenorrhea shows that taking rhubarb root and rhizome powder 2520 mg daily, beginning 2 days before menstruation and continuing for 5 days, repeated for three consecutive cycles, has similar efficacy to mefenamic acid 500 mg three times daily in reducing pain and improving quality of life. Those receiving either treatment experienced an overall improvement of greater than 80%, which is attributed to a reduction in pain, fatigue, headache, and gastrointestinal symptoms (92300).
• Gastrointestinal bleeding. It is unclear if spraying rhubarb powder with a gastroscope reduces gastrointestinal bleeding. Details: In patients with acute gastrointestinal bleeding, a meta-analysis of mainly preliminary clinical research shows that spraying rhubarb powder under a gastroscope has a small to moderate hemostatic effect over 24-72 hours when compared with norepinephrine. The risk of re-bleeding over 48 hours was also reduced by about 58% (103474).
• Herpes labialis (cold sores). Topical rhubarb has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Clinical research shows that applying a cream containing rhubarb and sage to cold sores is similarly effective to acyclovir (Zovirax) cream. Acyclovir cream heals lesions in about 6.3 days; the rhubarb and sage cream heals lesions in about 7.2 days (10437). It is not clear if these improvements are due to the treatments used or to the natural resolution of the cold sores. Additionally, it is unclear if the benefit is due to rhubarb, other ingredients, or the combination.
• Hypercholesterolemia. It is unclear if oral rhubarb helps to lower cholesterol levels. Details: A very small clinical study including 10 males with hypercholesterolemia shows that eating ground rhubarb stalk fiber 27 grams daily for 4 weeks reduces total cholesterol by 8% and low-density lipoprotein (LDL) cholesterol by 9%, but does not affect high-density lipoprotein (HDL) cholesterol levels, when compared to baseline (71363). The validity of these findings is limited by the very small study size and the lack of a comparator group.
• Malignant pleural effusions. Topical rhubarb powder has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: A small clinical study in patients living in China with advanced malignant cancer and malignant pleural effusions shows that applying a combination product (Hehuang Company) containing rhubarb powder 100 grams and mirabilite 400 grams to the chest wall for 8 hours daily for 28 days as an adjunct to standard therapy leads to partial or complete reduction of effusion in 67% of participants, compared with 55% of those receiving placebo and standard therapy (105961).
• Nasopharyngeal cancer. Oral rhubarb has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Preliminary clinical research in patients with nasopharyngeal carcinoma shows that taking a specific combination product (Shenlong) containing rhubarb and other herbs along with radiation therapy does not improve tumor remission or survival when compared to radiation therapy alone (71380).
• Nonalcoholic fatty liver disease (NAFLD). Oral rhubarb has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Preliminary clinical research in patients with NAFLD shows that taking 3-5 tablets of a specific Chinese herbal medicine (Danning Pian) containing rhubarb, giant knotweed, dried green orange peel, and dried ripe orange peel three times daily for 3 month improves lipids, liver function, and clinical symptoms (71315). It is not clear if this effect is due to rhubarb, the other ingredients, or the combination.
• Obesity. It is unclear if oral rhubarb is beneficial for weight loss. Details: A small clinical study in overweight and obese females shows that taking rhubarb with ginger, astragalus, red sage, and turmeric does not reduce body weight when compared with placebo (20346).
• Organophosphorus pesticide poisoning. It is unclear if giving rhubarb by gastric tube, nasal feeding, or enema is beneficial for organophosphorus pesticide poisoning. Details: A meta-analysis of low-quality clinical research in patients with acute organophosphorus pesticide poisoning shows that taking crude rhubarb 9-120 grams daily via gastric tube, nasal feeding, or retention enema, in conjunction with standard treatment, decreases the incidence of intermediate syndrome by 78% and organ dysfunction syndrome by 66% when compared to standard treatment alone. Rhubarb also reduces the duration of hospital stay by 2.8 days, but with no change in mortality rate, when compared to standard treatment alone. Standard treatment in these studies included atropine, pralidoxime, ventilation, diuresis, other supportive measures, and/or mannitol (92303).
• Sepsis. It is unclear if oral rhubarb is beneficial for sepsis. Details: A meta-analysis of low-quality clinical research in patients with sepsis or systemic inflammatory response syndrome (SIRS) shows that taking rhubarb powder in conjunction with conventional therapy reduces the incidence of gastrointestinal dysfunction, but does not reduce mortality rate, when compared to conventional therapy alone (92305).
• Stroke. Oral rhubarb has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: A meta-analysis of clinical research in patients with acute ischemic stroke shows that taking traditional Chinese medicine containing rhubarb root and rhizome in conjunction with traditional Western medicine for up to 30 days enhances overall clinical improvement by 27% when compared with traditional Western medicine alone. However, the validity of this outcome is limited by small sample size, the variability in the Chinese medicine formulas used, and the high risk for bias of the included studies (92299). More evidence is needed to rate rhubarb for these uses.

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INSUFFICIENT RELIABLE EVIDENCE to RATE

• Cancer. Oral slippery elm has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Retrospective population research has found that taking a specific product containing burdock root, Indian rhubarb, sheep sorrel, and slippery elm bark (Essiac, Resperin Canada Limited) does not improve quality of life in breast cancer patients and may have a negative effect on physical well-being (37419).
• Constipation. Although there has been interest in using oral slippery elm for constipation, there is insufficient reliable information about the clinical effects of slippery elm for this purpose.
• Cough. Although there has been interest in using lozenges containing slippery elm for cough, there is insufficient reliable information about the clinical effects of slippery elm for this purpose.
• Diarrhea. Although there has been interest in using oral slippery elm for diarrhea, there is insufficient reliable information about the clinical effects of slippery elm for this purpose.
• Inflammatory bowel disease (IBD). Although there has been interest in using oral slippery elm for IBD, including Crohn disease and ulcerative colitis, there is insufficient reliable information about the clinical effects of slippery elm for this purpose.
• Irritable bowel syndrome (IBS). Oral slippery elm has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Preliminary clinical research shows that taking a specific formulation containing slippery elm inner bark, lactulose, oat bran, and licorice root can improve stool frequency by 20% and reduce abdominal pain and bloating in people with constipation-predominant IBS when compared to baseline. Also, taking a different formulation containing slippery elm inner bark, bilberry fruit, cinnamon quilts, and agrimony aerial parts can reduce abdominal pain, bloating, and flatulence in people with diarrhea-predominant IBS when compared to baseline, although stool frequency is increased in these individuals as well (35462). It is unclear if these findings are due to slippery elm, other ingredients, or the combination.
• Peptic ulcers. Although there has been interest in using oral slippery elm for peptic ulcers, there is insufficient reliable information about the clinical effects of slippery elm for this purpose.
• Pharyngitis. It is unclear if lozenges containing slippery elm are beneficial in patients with sore throat. Details: Slippery elm has demulcent properties and, when added to lozenges, may soothe sore throats (272,512,1740). However, clinical research is lacking. More evidence is needed to rate slippery elm for these uses.

(Read more about SLIPPERY ELM)

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Breast cancer. Oral sorrel has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: A retrospective review of females with breast cancer shows that taking a specific combination product containing sorrel, burdock root, rhubarb, and slippery elm bark (Essiac, Resperin Canada Limited) does not improve quality of life or mood when compared with a historical control group (37419).
• Bronchitis. Although there is interest in using oral sorrel for bronchitis, there is insufficient reliable information about the clinical effects of sorrel for this condition.
• Rhinosinusitis. Oral sorrel has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Taking sorrel orally as a specific combination product that also contains gentian root, elderflower, verbena, and cowslip flower (SinuComp; Sinupret, Bionorica Arzneimittel GmbH), 2 tablets or 50 drops three times daily for up to 14 days, seems to improve symptoms of acute or chronic rhinosinusitis, such as congestion and headache (374,379,64515,75140). Taking this combination product orally three times daily in combination with mometasone furoate nasal spray (Nasonex) 200 mcg twice daily for 7 days improves symptoms, such as nasal obstruction, rhinorrhea, facial pain and pressure, impaired sense of smell, and mucopurulent secretions, when compared with mometasone nasal spray alone (95907). It is unclear if these effects are due to sorrel, other ingredients, or the combination. More evidence is needed to rate sorrel for these uses.

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LIKELY SAFE ...when used in amounts commonly found in foods (12659,12660). Burdock root is commonly eaten as a vegetable (37422,92153,92154)

POSSIBLY SAFE ...when used topically, short-term. An emulsion containing burdock fruit extract 1.2% has been safely applied to the face twice daily for 4 weeks (37420). There is insufficient reliable information available about the safety of burdock when used orally in supplemental doses.

PREGNANCY AND LACTATION:
Insufficient reliable information available; avoid using.

(Read more about BURDOCK)

LIKELY SAFE ...when the stalk is used in amounts commonly found in foods and when the root is used as a food flavoring. Rhubarb has Generally Recognized as Safe (GRAS) status in the US (4912).

POSSIBLY SAFE ...when the root or rhizome is used orally and appropriately in medicinal amounts for up to 2 years (92294,92295,92297). ...when the stalk is used orally and appropriately in medicinal amounts for up to 4 weeks (71351,71363,97920). ...when used topically and appropriately (10437,97919).

POSSIBLY UNSAFE ...when the leaf is used orally. Rhubarb leaf contains oxalic acid and soluble oxalate, which can cause abdominal pain, burning of the mouth and throat, diarrhea, nausea, vomiting, seizures, and death (17).

PREGNANCY AND LACTATION: POSSIBLY UNSAFE
when used in medicinal amounts, rhubarb root is a stimulant laxative; avoid using (12).

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POSSIBLY SAFE ...when used orally and appropriately (4,12,272,512,1740).

PREGNANCY AND LACTATION:
Insufficient reliable information available; avoid using. Slippery elm bark has historically been inserted into the cervix to induce abortion. As a result, slippery elm has been reported in some sources to have abortifacient activity. However, there is no reliable information available about whether slippery elm has abortifacient activity when taken orally.

(Read more about SLIPPERY ELM)

POSSIBLY SAFE ...when used orally in amounts commonly found in foods. There is insufficient reliable information available about the safety of sorrel used in medicinal amounts.

POSSIBLY UNSAFE ...when used orally in large amounts. The oxalate content may cause serious adverse effects, including damage to the kidneys, liver, and gastrointestinal tract (71314,75138,94019).

PREGNANCY AND LACTATION: POSSIBLY SAFE
when used orally in amounts commonly found in foods. There is insufficient reliable information available about the safety of sorrel used in medicinal amounts during pregnancy and lactation; avoid using.

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ANTICOAGULANT/ANTIPLATELET DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, taking burdock with anticoagulant or antiplatelet drugs might increase the risk of bleeding.  Details In vitro research shows that lignans from burdock reduce rabbit platelet aggregation by inhibiting platelet activating factor (12619). This interaction has not been reported in humans.

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CORTICOSTEROIDS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, frequent and high doses of rhubarb might increase the risk of hypokalemia when taken with corticosteroids.  Details Rhubarb has stimulant laxative effects. Overuse of rhubarb might compound corticosteroid-induced potassium loss (2,12).

CYCLOSPORINE (Neoral, Sandimmune) Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, taking rhubarb with cyclosporine might reduce cyclosporine levels.  Details Animal research shows that co-administration of rhubarb decoction 0.25 or 1 gram/kg with cyclosporine 2.5 mg/kg, decreases cyclosporine maximum plasma concentration and overall exposure levels when compared with taking cyclosporine alone. The authors theorize that rhubarb might reduce cyclosporine bioavailability by inducing of P-glycoprotein and/or cytochrome P450 3A4 (92304). However, since rhubarb was administered as a single oral dose and enzyme induction usually occurs after multiple doses, it is possible that cyclosporine absorption was actually reduced via rhubarb's stimulant laxative effects (12). Also, the composition of the rhubarb decoction was not described.

DIGOXIN (Lanoxin) Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, overuse of rhubarb might increase the risk of adverse effects when taken with digoxin.  Details Rhubarb has stimulant laxative effects. Overuse of rhubarb might cause potassium depletion, increasing the risk of digoxin toxicity (12,19).

DIURETIC DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, frequent and high doses of rhubarb might increase the risk of hypokalemia.  Details Rhubarb has stimulant laxative effects. Overuse of rhubarb might cause potassium depletion and compound diuretic-induced potassium loss (12,19).

HEPATOTOXIC DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, concomitant use of rhubarb with potentially hepatotoxic drugs might increase the risk of developing liver damage.  Details Some animal research suggests that anthraquinones in rhubarb might have hepatotoxic effects (105960). Also, rhubarb use has been linked to at least 24 cases of liver injury, although details on the dose of rhubarb and duration of use in these cases is unclear (100963).

NEPHROTOXIC DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, long-term use of anthraquinones from rhubarb might increase the risk of nephrotoxicity when used with nephrotoxic drugs.  Details The anthraquinone constituents of rhubarb have been shown to induce nephrotoxicity in animal research (71322). Additionally, in a case report, a 23-year old female presented with kidney failure after taking 6 tablets of a proprietary slimming agent (found to contain the anthraquinones emodin and aloe-emodin from rhubarb) daily for 6 weeks and then adding diclofenac 25 mg 4 times daily for 2 days. The authors postulate that the anthraquinone constituents of rhubarb contributed to the renal dysfunction, and the addition of diclofenac, a nephrotoxic drug, led to renal failure (15257). Until more is known, advise patients to avoid taking rhubarb if they are taking other potentially nephrotoxic drugs.

STIMULANT LAXATIVES Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, rhubarb might increase the risk for fluid and electrolyte loss when taken with other stimulant laxatives.  Details Rhubarb has stimulant laxative effects (12). Concomitant use with stimulant laxatives might compound fluid and electrolyte loss (24427).

WARFARIN (Coumadin) Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, excessive use of rhubarb might increase the risk of bleeding when taken with warfarin.  Details Rhubarb has stimulant laxative effects and can cause diarrhea (12,19). Diarrhea can increase the effects of warfarin, increase international normalized ratio (INR), and increase the risk of bleeding. Advise patients who take warfarin not to take excessive amounts of rhubarb.

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ORAL DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, slippery elm may slow the absorption and reduce serum levels of oral drugs.  Details Slippery elm inner bark contains mucilage, which may interfere with the absorption of orally administered drugs (19).

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ANTICOAGULANT/ANTIPLATELET DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, sorrel might cause additive effects and side effects when used with anticoagulant or antiplatelet drugs.  Details In vitro, sorrel has been shown to inhibit platelet aggregation (103607). However, this effect has not been reported in humans.

FEXOFENADINE (Allegra) Interaction Rating = Moderate Be cautious with this combination. Severity = Mild •  Occurrence = Likely •  Level of Evidence = D Sorrel might reduce the effectiveness of fexofenadine by reducing its absorption from the gut.  Details In vitro research shows that an ethanol extract of sorrel inhibits organic anion-transporting polypeptide 1A2 (OATP1A2), which transports fexofenadine from the intestine into cells. In rats, concomitant administration of sorrel extract with fexofenadine reduces oral absorption of fexofenadine and the area under the plasma concentration-time curve (AUC) (103606).

ORGANIC ANION-TRANSPORTING POLYPEPTIDE SUBSTRATES (OATP) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Sorrel might reduce the effectiveness of OATP substrates by reducing their absorption from the gut.  Details In vitro research shows that sorrel inhibits OATP1A2 (103606). Theoretically it may inhibit other OATPs. The OATPs are expressed in the small intestine and liver and transport drugs into cells. Inhibition of OATP may reduce the bioavailability of oral drugs that are substrates of OATP.

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General ...Orally, burdock is well tolerated when consumed as a food. Although a thorough evaluation of safety outcomes is lacking, there has been long-standing historical use of burdock with few noted adverse effects.
Serious Adverse Effects (Rare):
All ROAs: Allergic reactions, including contact dermatitis and anaphylaxis.

Dermatologic ...Contact dermatitis has been reported secondary to burdock, especially after prolonged use of the root oil (37422). There are cases of allergic dermatitis secondary to using burdock plasters. Two males and a 14 year-old female developed erythematous and vesicular, pruritic, and exudative reactions in areas corresponding to the application of burdock root plasters (12667). Reactions occurred up to 7 days after initial use. Patch testing was positive for burdock sensitivity in all three patients and was nonreactive in matched controls.

Hematologic ...In one case report, a 38-year-old female developed immune-mediated thrombocytopenia after consuming a "cleansing" tea containing unknown amounts of burdock and yellow dock. The patient presented with bruising, mild weakness, and fatigue, which started 2-3 days after consuming the tea, and was found to have a platelet count of 5,000 per mcL. Symptoms resolved after platelet transfusion and treatment with oral dexamethasone (108971). It is unclear if these effects were caused by burdock, yellow dock, the combination, or other contributing factors.

Hepatic ...A case of idiosyncratic drug-induced liver disease (DILI) is reported in a 36-year-old female who presented with abdominal pain after 1 month of taking an herbal liver detox tea containing burdock and other ingredients. Remarkable laboratory values included elevated liver enzymes, alkaline phosphatase, and total bilirubin. The patient received a loading dose of N-acetylcysteine and was hospitalized for 12 days (112178). However, it is unclear if the adverse effect was due to burdock, other ingredients, or the combination.

Immunologic ...There is one case of anaphylactic shock secondary to eating boiled burdock. One hour after eating boiled burdock the patient presented with redness over the entire body and dyspnea. He was found to have low blood pressure and was treated with subcutaneous epinephrine 1 mg and intravenous lactated ringer's solution containing hydrocortisone 100 mg and dexamethasone 8 mg. The cause of anaphylactic shock was attributed to allergenicity to burdock based on positive skin prick test results. Previously, the patient had experienced urticaria after eating boiled burdock (12660).

Neurologic/CNS ...Anticholinergic reactions including dry mouth, dizziness, blurred vision, weakness, dilated pupils, inability to urinate, and bradycardia have been reported following the consumption of burdock products (12662,37421,37431,37434,37435). However, these anticholinergic reactions are believed result from contamination of burdock with belladonna alkaloids. Burdock itself does not contain atropine or other constituents that would be responsible for these reactions.

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General ...Orally, rhubarb root and stalk are well tolerated when used in food amounts and seem to be well tolerated when used in medicinal amounts. Rhubarb leaf contains oxalic acid and can be toxic. Topically, rhubarb seems to be well tolerated.
Most Common Adverse Effects:
Orally: Cramps, diarrhea, gastrointestinal discomfort, nausea, vomiting.
Topically: Rash.
Serious Adverse Effects (Rare):
Orally: Anaphylaxis.

Cardiovascular ...Orally, chronic use or abuse of rhubarb can cause arrhythmias (12).

Dermatologic ...Orally, rhubarb taken alone or in combination with other ingredients has been reported to cause rash (71315,71342). Topically, short term application of a specific product (Pyralvex) containing rhubarb, salicylic acid, and ethanol to the gums has been reported to cause slight burning and dark discoloration of the gums in approximately 1% of patients (71369). It is unclear if this effect is due to rhubarb, other ingredients, or the combination.

Endocrine ...Orally, chronic use or abuse of rhubarb can cause electrolyte loss (especially potassium), hyperaldosteronism, albuminuria, and edema (12).

Gastrointestinal ...Orally, rhubarb can cause cramp-like or spasmodic gastrointestinal discomfort, watery diarrhea, and uterine contractions (18). Rhubarb, alone or in combination with other ingredients, has also been reported to cause bloating, nausea, diarrhea, vomiting, and stomach upset or pain in clinical studies. Diarrhea is more common with a starting dose of at least 3 grams of extract (71315,71329,71339,71340,71341,71342,71373,92300). Chronic use or abuse of rhubarb can cause inhibition of gastric motility and pseudomelanosis coli (pigment spots in the intestinal mucosa) (12,6138).
Although some research suggests that rhubarb and other anthranoid laxatives might increase the risk of colorectal cancer due to pseudomelanosis coli (30743), more recent research suggests that this condition is harmless, typically reversed with rhubarb discontinuation, and not associated with an increased risk for colorectal adenoma or carcinoma (6138).

Hematologic ...Orally, chronic use or abuse of rhubarb can cause hematuria (12).

Hepatic ...Orally, chronic use of anthraquinone-containing products, such as rhubarb, has been associated with hepatotoxicity (15257). Use of rhubarb specifically has been linked to at least 24 reports of liver injury, although details on the dose of rhubarb and duration of use in these cases are not clear (100963). In one clinical study, rhubarb, taken in combination with other ingredients, has been reported to cause mild to moderate elevations of serum alanine aminotransferase (71315).

Immunologic ...Orally, rhubarb has rarely been reported to cause anaphylaxis (18).

Musculoskeletal ...Orally, chronic use or abuse of rhubarb can cause accelerated bone deterioration and muscular weakness (12).

Renal ...Orally, chronic use or abuse of rhubarb can cause electrolyte loss (especially potassium), albuminuria, hematuria, dehydration, and nephropathies (12). There is one case report of renal failure in a patient who took a product containing rhubarb for six weeks. The patient presented with renal failure two days after starting diclofenac, which is known to have nephrotoxic effects. It is hypothesized that the combination of diclofenac with the anthraquinone constituents of rhubarb precipitated renal dysfunction (15257).

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General ...Orally, slippery elm seems to be well tolerated. A thorough evaluation of safety outcomes with topical use of slippery elm has not been conducted.

Dermatologic ...Topically, slippery elm extracts can cause contact dermatitis. The pollen is an allergen (6). Contact dermatitis and urticaria have been reported after exposure to slippery elm or an oleoresin contained in the slippery elm bark (75131).

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General ...Orally, sorrel seems to be generally well tolerated, based on limited data, mainly from studies with combination products.
Serious Adverse Effects (Rare):
Orally: Gastrointestinal irritation, kidney damage, liver necrosis.

Dermatologic ...Orally, sorrel, when used in combination with other herbs, has been reported to cause allergic skin reactions (374,379).

Gastrointestinal ...Orally, sorrel, when used in combination with other herbs, has been reported to cause gastrointestinal side effects including nausea and an unpleasant aftertaste (374,379,37419).

Hepatic ...Extensive liver necrosis with hepatic failure has been reported with the ingestion of large amounts of sorrel; this was likely due to its oxalate content (75138).

Pulmonary/Respiratory ...Environmental exposure to sorrel pollen may trigger allergic rhinitis or bronchial asthma in hypersensitive individuals, and allergic cross-sensitivity may occur in up to 19% of people who are allergic to weed pollen (75141).

Renal ...Sorrel contains oxalates; irolithiasis and nephrosis may be caused by the systemic absorption of oxalates and may result in kidney damage (71314). A case of acute tubulointerstitial nephritis (TIN) has been reported in a 12-year-old who consumed an unknown amount of wild sorrel. The patient presented with polyuria, hypophosphatemia, proteinuria, glucosuria, and hyperoxaluria. Recovery occurred after oral rehydration and electrolyte replacement. The TIN was likely due to formation of calcium oxalate crystals in the kidneys (94019).

(Read more about SORREL)