Super Dieter's Tea Peppermint by Laci Le Beau

LIKELY EFFECTIVE

• Constipation. Taking senna orally is effective for the short-term treatment of constipation. Details: Senna is an FDA-approved nonprescription drug marketed for the short-term treatment of constipation in adults and children ages 2 years and older (15429,15433,15436,15441,15442,74545,74607,74609,74613,74615). Senna usually produces a laxative effect 6-10 hours after oral administration (15429,96559). However, in children ages 3-15 years, mineral oil and lactulose might be more effective (15434,15435). Taking senna with psyllium is also effective for the short-term treatment of constipation (8424,74593), with the combination increasing stool moisture to a greater degree than psyllium alone (8424). In patients with opioid or loperamide-induced constipation, taking senna appears to be as effective as lactulose, psyllium, and docusate for relieving constipation (15432,74586,74644,74650). Some population research has found that senna may be more effective than docusate, polyethylene glycol, and lactulose for preventing problematic constipation, the need for an enema, and abdominal imaging in pediatric cancer patients receiving opioids (92710). Senna also seems to be beneficial in chronic constipation. Clinical guidelines published by the American Gastroenterology Association and American College of Gastroenterology in 2023 give a conditional recommendation suggesting the use of senna over managing chronic idiopathic constipation without senna based on low-quality of evidence conducted over 4 weeks (112859). In geriatric patients, senna plus psyllium is more effective than lactulose for treating chronic constipation (15438,15439,15440). Also, a small study in middle-aged adults with chronic idiopathic constipation shows that taking senna (ALOSENN granules) 500 mg twice daily for 4 weeks seems to be similarly effective to taking magnesium oxide 500 mg three times daily (105959).

POSSIBLY EFFECTIVE

• Bowel preparation. Taking oral senna might be effective for bowel cleansing before colonoscopy. Details: A meta-analysis of 10 clinical trials in adults shows that taking senna alone or with other bowel preparations does not improve bowel cleansing before elective colonoscopy when compared with non-senna bowel preparations. However, in a subgroup analysis of 3 clinical studies, taking senna solution alone is about 2.5 times more likely to result in a clean bowel when compared with polyethylene glycol alone (112893). The interpretation of these findings is limited by varied senna dosages and regimens. Additionally, 2 clinical studies that were not included in this meta-analysis show that senna is as effective or more effective than polyethylene glycol for improving bowel cleanse quality (15431,40088). Conversely, other studies show that polyethylene glycol is superior to senna (40086,74587,74606,74636). It is also unclear if taking senna with polyethylene glycol improves bowel cleansing when compared with polyethylene glycol alone (74583,74585). Some clinical studies show that senna is as effective as castor oil and bisacodyl for bowel cleansing (74548,74603,74624). Although taking senna alone is less effective than sodium phosphate (15431,74567,74570,74653,92712), some evidence suggests that taking a combination of senna, sodium picosulfate, and polyethylene glycol is more effective than sodium phosphate for bowel cleansing prior to colonoscopy (74538). Limited research has also assessed the benefit of adding senna to a preparation regimen for small bowel capsule endoscopy; however, it is unclear whether the addition of senna improves endoscopy outcomes when compared with the preparation regimen alone (96557). There is insufficient reliable information available about the effectiveness of senna for its other uses.

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INSUFFICIENT RELIABLE EVIDENCE to RATE

• Diabetes. It is unclear if oral stevia is beneficial in patients with diabetes; the available research is conflicting. Details: A small single-dose study shows that taking stevia leaf extract 1000 mg, standardized to contain 91% stevioside, along with a meal reduces postprandial glucose levels by 18% in adults with type 2 diabetes when compared with a starch control (11812). However, clinical research in patients with type 1 or type 2 diabetes shows that taking stevioside 250 mg three times daily for 3 months does not affect blood glucose levels or glycated hemoglobin (HbA1C) when compared with baseline (16705). Also, a small clinical study in patients with diabetes shows that drinking 200 mL of black tea, sweetened with stevia extract 2%, three times daily for 8 weeks does not affect glycemic indices when compared with drinking tea sweetened with sucralose (103695).
• Hypertension. It is unclear if oral stevia is beneficial in patients with hypertension; the available research is conflicting. Details: Some clinical research in patients with mild to moderate hypertension shows that taking stevioside, a constituent of stevia, 750-1500 mg in three divided doses daily reduces systolic blood pressure by 10-14 mmHg and diastolic blood pressure by 6-14 mmHg within one week to three months of treatment initiation and continuing for up to 2 years (11809,11810). However, other clinical research in patients with mild hypertension shows that taking stevioside in doses up to 15 mg/kg daily does not significantly reduce blood pressure (16706).
• Obesity. It is unclear if oral stevia is beneficial in patients with obesity; the available research is conflicting. Details: Although a small clinical study in healthy adults shows that drinking water with stevia (Truvia) 245 ppm as a single dose reduces appetite and energy intake when compared with drinking water alone (103697), other small, single-dose studies have shown no effect of stevia 15.3 mg or 1 gram as a single dose on satiety, energy intake, or fullness when compared with either water alone or a non-nutritive sweetener (103696,110124). A small clinical study in healthy adults shows that taking an aqueous stevia leaf extract (SweetLeaf) twice daily for 12 weeks does not affect body weight, compared with an increase in weight in the control group. This suggests that stevia extract may have attenuated weight gain in this study (106458). More evidence is needed to rate stevia for these uses.

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LIKELY SAFE ...when used orally and appropriately, short-term. Senna is an FDA-approved nonprescription drug (8424,15429,15431,15442,40086,40088,74535,74545,74548,74562)(74567,74570,74583,74585,74586,74587,74593,74603,74606,74607)(74609,74613,74615,74624,74636,74639,74644,74650,74653,92711)(92712).

POSSIBLY UNSAFE ...when used orally long-term or in high doses. Long-term, frequent use, or use of high doses has been linked to serious side effects including laxative dependence and liver toxicity (13057,13095).

CHILDREN: LIKELY SAFE
when used orally and appropriately, short-term. Senna is an FDA-approved nonprescription drug for use in children 2 years and older. (15429,15434,15435).

CHILDREN: POSSIBLY UNSAFE
when used orally long-term or in high doses. Long-term, frequent use, or use of high doses has been linked to serious side effects including laxative dependence and liver toxicity (13057,13095,105956).

PREGNANCY: POSSIBLY SAFE
when used orally and appropriately, short-term (15429,24480). POSSIBLY UNSAFE...when used orally long-term or in high doses. Long-term, frequent use, or use of high doses has been linked to serious side effects including laxative dependence and liver toxicity (13057,13095).

LACTATION: POSSIBLY SAFE
when used orally and appropriately, short term. Although small amounts of constituents of senna cross into breast milk, senna has been taken while breast-feeding with apparent safety. Senna does not cause changes in the frequency or consistency of infants' stools. (6026,15429,15436,15437,24482,24484,24485,24486,24487,74545).

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LIKELY SAFE ...when certain stevia constituents, including stevioside and rebaudiosides A, D, and M, are used orally as sweeteners in foods. These constituents have generally recognized as safe (GRAS) status in the US for this purpose (16699,16700,16702,16705,16706,108049). The stevia constituent stevioside has been safely used in doses of up to 1500 mg daily for 2 years (11809,11810,11811). There is insufficient reliable information available about the safety of whole stevia or stevia extracts when used orally. The European Food Safety Authority (EFSA) has determined that the acceptable intake of steviol glycosides is 4 mg/kg daily (106456); however, it is unclear how this relates to the use of whole stevia or stevia extract.

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

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DIGOXIN (Lanoxin) Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, senna might increase the risk of adverse effects when taken with digoxin.  Details Overuse/abuse of senna increases the risk of adverse effects from cardiac glycosides, such as digoxin, due to potassium depletion (15425).

DIURETIC DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, senna might increase the risk of hypokalemia when taken with diuretic drugs.  Details Overuse of senna might compound diuretic-induced potassium loss and increase the risk for hypokalemia (15425).

ESTROGENS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = B Theoretically, taking senna may interfere with the absorption of exogenous estrogens.  Details Some preliminary clinical evidence suggests that senna reduces the absorption of estradiol and decreases serum concentrations of estrone and estrone sulfate by decreasing intestinal transit time (74647,74651).

STIMULANT LAXATIVES Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, senna might increase the risk for fluid and electrolyte loss when taken with other stimulant laxatives.  Details Senna is a stimulant laxative; concomitant use with other stimulant laxatives might compound fluid and electrolyte loss (19,15425).

WARFARIN (Coumadin) Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, excessive use of senna might increase the effects of warfarin.  Details Senna has stimulant laxative effects and can cause diarrhea. Diarrhea can increase the effects of warfarin, increase international normalized ratio (INR), and increase the risk of bleeding. In one case report, excessive use of senna for 3 weeks resulted in diarrhea, bloody stools, and an elevated INR of 11.9 (16530).

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ANTIDIABETES DRUGS Interaction Rating = Minor Be watchful with this combination. Severity = Mild •  Occurrence = Possible •  Level of Evidence = D Theoretically, stevia might increase the risk for hypoglycemia when combined with antidiabetes drugs.  Details Preliminary clinical research in patients with type 2 diabetes suggests that taking a single dose of stevia extract 1000 mg reduces postprandial blood glucose levels when taken with a meal (11812). However, other clinical research in patients with type 1 or type 2 diabetes suggests that taking stevioside 250 mg three times daily does not significantly affect blood glucose levels or glycated hemoglobin (HbA1C) after three months of treatment (16705).

ANTIHYPERTENSIVE DRUGS Interaction Rating = Minor Be watchful with this combination. Severity = Mild •  Occurrence = Possible •  Level of Evidence = D Theoretically, combining stevia or stevia constituents with antihypertensive agents might increase the risk of hypotension.  Details Stevia extract and stevioside might lower blood pressure in patients with hypertension (3745,3747,5031,11809,11810). However, other clinical research suggests that stevioside does not significantly lower blood pressure in patients with hypertension (16706).

LITHIUM Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, stevia might decrease clearance and increase levels of lithium.  Details Animal research suggests that stevia extracts might have diuretic activity (3746,3747). Theoretically, increased reabsorption of lithium along with sodium might reduce excretion and increase levels of lithium.

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General ...Orally, senna is generally well-tolerated when used short-term in appropriate doses.
Most Common Adverse Effects:
Orally: Abdominal pain and discomfort, cramps, diarrhea, flatulence, nausea, fecal urgency, and urine discoloration.
Serious Adverse Effects (Rare):
Orally: Skin eruptions.

Cardiovascular ...Excessive use can cause potassium depletion and other electrolyte abnormalities (15425). In theory, this could cause potentially dangerous changes in heart rhythm. A small decrease in heart rate was seen in one clinical study (74587).

Dermatologic ...In adults, there are rare case reports of skin eruptions associated with senna, including erythema multiforme, fixed drug eruption, lichenoid reaction, toxic epidermal necrolysis, urticaria, photosensitivity, and contact dermatitis (96558). Infants and young children given senna products have experienced contact reactions on the buttocks due to prolonged exposure to stool while wearing a diaper overnight. These reactions range from erythema with small blisters, to large fluid-filled blisters with skin sloughing, as occurs with second degree burns (96559). In a case series of children treated with senna for chronic constipation, burn-like reactions occurred in 2.2%, typically with higher doses (mean 60 mg/day, range 35.2 to 150 mg/day) (96558,96559). These reactions can be avoided by giving senna early in the day, so that bowel movements occur at a time when diapers can be changed quickly (96559).

Gastrointestinal ...Orally, senna can cause abdominal pain and discomfort, cramps, bloating, flatulence, nausea, fecal urgency, and diarrhea (15427,15434,15435,15436,15439,15440,15441,105955). Chronic use has also been associated with "cathartic colon," radiographically diagnosed anatomical changes to the colon such as benign narrowing, colonic dilation, and loss of colonic folds (15428). The clinical relevance of these findings is unclear. Chronic use can also cause pseudomelanosis coli (pigment spots in intestinal mucosa) which is harmless, usually reverses with discontinuation, and is not associated with an increased risk of developing colorectal adenoma or carcinoma (6138). The cathartic properties of senna leaf are greater than the fruit (15430). Thus, the American Herbal Products Association only warns against long-term use of senna leaf (12).

Hepatic ...Chronic liver damage, portal vein thrombosis, and hepatitis have been reported following oral use of senna alkaloids, such as in tea made from senna leaves (13057,13095,41431,74560,74564,74584,105956). There is a case report of hepatitis in a female who consumed moderate amounts of senna tea. The patient was a poor metabolizer of cytochrome P450 2D6 (CYP2D6). It's thought that moderate doses of senna in this patient led to toxic hepatitis due to the patient's reduced ability to metabolize and eliminate the rhein anthrone metabolites of senna, which are thought to cause systemic toxicity (13057). There is also a case of liver failure, encephalopathy, and renal insufficiency in a female who consumed 1 liter/day of senna tea, prepared from 70 grams of dried senna fruit, over 3 years (13095). In another case report, a 3-year-old female presented with hepatitis that led to pancytopenia after drinking tea made from 2-3 grams dry senna leaves three times or more weekly for over one year (105956).

Immunologic ...In one case report, a 19-year-old male developed anaphylaxis with dyspnea, facial edema, and hives. This reaction was determined to be caused by the senna content in a specific combination product (Delgaxan Plus, Pompadour Ibérica) that the patient ingested (105957).

Musculoskeletal ...Hypertrophic osteoarthropathy, finger clubbing, cachexia, and tetany have been reported from excessive oral senna use in humans (15426,74580,74582,74620,74625).

Renal ...Nephrocalcinosis has been reported as a result of oral senna overuse (74582).

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General ...Orally, stevia and steviol glycosides appear to be well tolerated. Most minor adverse effects seem to resolve after the first week of use.
Most Common Adverse Effects:
Abdominal bloating, dizziness, headache, myalgia, nausea, and numbness.
Serious Adverse Effects (Rare):
Allergic reactions.

Gastrointestinal ...Orally, stevia and steviol glycosides such as stevioside, can cause gastrointestinal adverse effects such as abdominal fullness and nausea. However, these generally resolve after the first week of use (11809,11810).

Immunologic ...Theoretically, stevia might cause allergic reactions in individuals sensitive to plants in the Asteraceae/Compositae family (11811). Members of this family include ragweed, chrysanthemums, marigolds, daisies, and many other herbs.

Musculoskeletal ...Orally, stevia and steviol glycosides may cause myalgia, but this generally resolves after the first week of use (11809,11810).

Neurologic/CNS ...Orally, stevia and steviol glycosides may cause headache, dizziness, and numbness (11809,11810).

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