Saw Palmetto Complex by DC

POSSIBLY EFFECTIVE

• Benign prostatic hyperplasia (BPH). Taking oral pumpkin seed or pumpkin seed oil may improve symptoms of BPH. Details: One study in patients with BPH shows that taking pumpkin seed 5 grams twice daily for 12 months may be more effective for controlling symptoms than pumpkin seed extract 1000 mg twice daily (92383). A specific pumpkin seed extract (Prosta Pink Forte) 1-2 capsules daily for 12 weeks has also been used (11231). Some preliminary clinical research also suggests that taking pumpkin seed oil (Prostafit, EuRho Vital) two tablets daily for 6 months may be as effective as the medication prazosin (92382). Pumpkin seed oil has also been compared with tamsulosin. A clinical study comparing pumpkin seed oil 360 mg twice daily to tamsulosin 0.4 mg once nightly for 3 months shows that both treatment groups report improvements in BPH symptoms and quality of life when compared with baseline, although improvement appears greater in the tamsulosin group, specifically when measured at 1 month and 3 months. In the pumpkin seed oil group, adverse effects were reported in 0% of patients, compared with 15% of patients taking tamsulosin (107842). The validity of this study is limited due to the short duration of treatment. Pumpkin seed oil or extracts have also been studied in combination with saw palmetto (6777), with saw palmetto, nettle root, and lemon extracts plus beta carotene (5093), and with saw palmetto, small flowered willow herb, lycopene, and pygeum (92379).

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Androgenic alopecia. Oral pumpkin seed oil might improve hair regrowth in males with mild to moderate hair loss. Details: Clinical research in males with mild to moderate hair loss shows that taking pumpkin seed oil (Octa Sabal Plus, Dreamplus Co. Ltd.) 400 mg daily in divided doses for 24 weeks increases hair count by 30% when compared with placebo. Self-rated improvement and satisfaction scores were 62% and 52% with pumpkin seed oil and placebo, respectively (92378). Clinical research in patients with female pattern hair loss shows that applying 1 mL of pumpkin seed oil to the scalp daily for 30 days improves hair regrowth similarly to minoxidil 5% foam, 1 mL daily (104974).
• Interstitial cystitis. Although there is interest in using oral pumpkin for interstitial cystitis, there is insufficient reliable information about the clinical effects of pumpkin for this condition.
• Intestinal parasite infection. Although there is interest in using oral pumpkin for intestinal parasite infection, there is insufficient reliable information about the clinical effects of pumpkin for this condition.
• Overactive bladder. Oral pumpkin seed oil has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: Preliminary clinical research in females with overactive bladder shows that taking a specific combination product (Granu Fink femina, Omega Pharma) containing pumpkin seed oil 227 mg, sweet sumac bark extract 56 mg, and hops cone extract 18 mg three times daily for 12 weeks decreases the frequency of urination and leakage and improves quality of life when compared to baseline (103253). The validity of these findings is limited by the lack of a control group. Additionally, it is unclear if these findings are due to pumpkin seed oil, other ingredients, or the combination.
• Urinary tract infections (UTIs). Although there is interest in using oral pumpkin for UTIs, there is insufficient reliable information about the clinical effects of pumpkin for this condition. More evidence is needed to rate pumpkin for these uses.

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POSSIBLY EFFECTIVE

• Transurethral resection of the prostate (TURP). Saw palmetto 320 mg daily seems to improve outcomes after TURP surgery in a dose-dependent manner. Details: Clinical research shows that taking saw palmetto (Permixon, Pierre Fabre Medicament) 320 mg daily for 2 months prior to TURP surgery reduces blood loss, the duration of surgery, the development of intraoperative complications, the duration of catheterization, and the length of hospitalization when compared with placebo (73323,73353). Although these studies found benefit, a small study using a lower dose of saw palmetto (Prostagood Mono, Abdi Ibrahim) 160 mg orally once daily for 5 weeks prior to TURP did not find any decrease in the risk of perioperative hemorrhage, or the density of prostate tissue (17202).

POSSIBLY INEFFECTIVE

• Benign prostatic hyperplasia (BPH). Although individual study results are conflicting, the overall body of evidence suggests that saw palmetto does not offer clinically meaningful improvements in BPH-related symptoms. Details: Research on the use of saw palmetto for improving symptoms of BPH is inconsistent and contradictory. To date, the best available evidence addressing the effectiveness of saw palmetto in patients with BPH comes from two high-quality clinical trials sponsored by the National Institutes of Health (NIH). In one of these trials, saw palmetto 160 mg twice daily for one year was ineffective for reducing moderate to severe symptoms of BPH when compared with placebo (14274). In the other trial, taking saw palmetto 320-960 mg daily for 72 weeks did not significantly improve symptoms when compared with placebo (17684). Additionally, meta-analyses of these trials and many of the small trials described below show that taking saw palmetto does not improve BPH-related signs and symptoms or International Prostate Symptom Scores (IPSS) (89441,102835). While several small, low-quality clinical trials and observational studies in patients with BPH suggest that saw palmetto provides some improvement in urinary symptoms, nocturia, urinary flow, and/or residual urine volume when compared with placebo or baseline (6750,6764,6772,73315,73383,73385,73387,89441,96570,110541), other studies show that saw palmetto has no clinically meaningful effect on BPH-related signs and symptoms, including prostate volume (5093,6752,11314,73343,96409). The validity of several of these studies is limited due to the use of per-protocol analyses and/or a lack of placebo control groups. Beyond this, reasons for these discrepant findings are unclear; however, the mixed results may be due to use of different saw palmetto products, varying study methodologies, different patient populations, and varying symptom scoring tools. Additionally, research shows significant variation in the chemical composition of commercially available saw palmetto extracts (17305,89441). Several clinical trials have compared saw palmetto to 5-alpha reductase inhibitors such as finasteride (Proscar) or dutasteride (Avodart). Some small studies suggest that it may be comparable to these medications for relieving BPH symptoms, but with less effect on prostate size or prostate-specific antigen (PSA) levels (6424,96570). It may also be better tolerated, with a positive effect on sexual dysfunction (6424,6763,18215,89441). Additionally, one observational study in patients with BPH has found that taking saw palmetto 320 mg with tamsulosin 0.4 mg daily for 6 months is associated with similar improvements in IPSS and quality of life scores, but also has a lower risk of reduced libido, when compared with tamsulosin plus dutasteride 5 mg or finasteride 0.5 mg daily (110542). Some research has also compared saw palmetto to alpha-adrenergic blockers. Alpha-adrenergic blockers appear to have a faster onset of symptom relief (2732,6750), and saw palmetto might be less effective than the alpha-adrenergic blocker prazosin (Minipress). Although some studies and a meta-analysis suggest it is similarly effective to tamsulosin (Flomax) after 6-12 months of treatment for improving various symptoms of BPH (6775,6776,11243,89441,96570,104804,107483), another meta-analysis found that alpha-blockers were more effective than saw palmetto for these outcomes (102835). Additionally, tamsulosin appears to be more effective than saw palmetto for reducing prostate volume (104802). However, some research suggests that saw palmetto may be better tolerated than tamsulosin (107483). It is unclear if taking saw palmetto with tamsulosin can improve BPH symptoms. Several low-quality studies and a meta-analysis of two of these studies show no additional benefit over using tamsulosin alone (8901,89443,89448,96410). However, one study suggests that a specific saw palmetto extract (Permixon, Pierre Fabre Medicament) 320 mg daily is associated with a 29% decrease in the IPSS when taken alone, compared with a 37% decrease when taken along with tamsulosin 0.4 mg daily for 6 months. Tamsulosin alone was associated with a 31% decrease (104802). Smaller, lower-quality studies of various combinations of saw palmetto with other ingredients have demonstrated some benefit for improving symptoms of BPH, and some have shown equivalence to finasteride, tamsulosin, or tadalafil (Cialis). These ingredients include stinging nettle root (PRO 160/120, Dr. Willmar Schwabe Pharmaceuticals) (6763,17307,73330,89441); cernitin, beta-sitosterol, and vitamin E (11241); selenium and lycopene (Profluss, Konpharma) (90354,97255); pygeum, lycopene, Epilobium parviflorum, and pumpkin seed oil (ProstateEZE Max, Caruso's Natural Health) (92164); and quercetin and beta-sitosterol (Difaprost, Difass International) (96784). Additionally, one study suggests that an enriched form of saw palmetto oil containing 3% beta-sitosterol seems to be more effective than standard saw palmetto oil containing 0.3% beta-sitosterol in reducing IPSS scores (104803).

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Androgenic alopecia. It is unclear if oral or topical saw palmetto is beneficial in patients with androgenic alopecia. Details: Clinical research shows that a combination of saw palmetto extract 200 mg plus beta-sitosterol 50 mg taken twice daily for 18-24 months improves subjective scores of hair quantity and quality in males with androgenic alopecia (15550). However, other clinical research shows that taking saw palmetto extract 320 mg daily for 24 months is less effective for improving hair growth in males with androgenic alopecia when compared with finasteride 1 mg daily (89444). Some clinical research shows that saw palmetto lotion applied topically twice daily for 50 weeks improves hair density by 27% in people with androgenic alopecia. However, a 13% improvement was observed in the placebo group, and no between-group comparisons were made (73435). Additionally, a small clinical study in males with androgenic alopecia receiving platelet-rich plasma every 3 weeks shows that applying 1 mL of topical saw palmetto, redensyl, and biotin daily for 12 weeks modestly improves subjective hair loss scores and photographic assessment of hair growth when compared with 1 mL of topical Procapil daily (112176). However, it is unclear if this effect is due to saw palmetto, other ingredients, or the combination.
• Asthma. Although there has been interest in using oral saw palmetto for asthma, there is insufficient reliable information about the clinical effects of saw palmetto for this purpose.
• Chronic bronchitis. Although there has been interest in using oral saw palmetto for chronic bronchitis, there is insufficient reliable information about the clinical effects of saw palmetto for this purpose.
• Chronic prostatitis and chronic pelvic pain syndrome (CP/CPPS). It is unclear if oral saw palmetto is beneficial in patients with CP/CPPS. Details: Preliminary clinical research shows that oral saw palmetto 325 mg daily for one year does not significantly improve symptoms of CP/CPPS when compared with finasteride 5 mg once daily (11354). However, a clinical trial in patients with moderate to severe CP/CPPS shows that taking saw palmetto 160 mg orally twice daily for 12 weeks improves NIH Chronic Prostatitis Index (NIH-CPSI) score after two weeks of treatment in patients with moderate disease and after 4 weeks of treatment in patients with severe disease when compared with placebo. Independent of severity, 73% of patients taking saw palmetto report a 6-point reduction in NIH-CPSI total score, compared to 33% of patients taking placebo (107482). Saw palmetto extract has also been evaluated in combination with other ingredients. A preliminary clinical study shows that taking a combination of saw palmetto extract 320 mg, selenium 50 mcg, and lycopene oil extract 5 mg daily for 8 weeks improves symptoms and peak flow in patients with CP/CPPS when compared with baseline. However, these effects were not observed or were less significant in patients treated with saw palmetto alone (60442).
• Common cold. Although there has been interest in using oral saw palmetto for the common cold, there is insufficient reliable information about the clinical effects of saw palmetto for this purpose.
• Hirsutism. Although there has been interest in using oral and topical saw palmetto for hirsutism, there is insufficient reliable information about the clinical effects of saw palmetto for this purpose.
• Non-neurogenic lower urinary tract symptoms (LUTS). It is unclear if oral saw palmetto is beneficial in females with non-neurogenic LUTS. Details: A small clinical study in elderly Japanese females with LUTS shows that taking saw palmetto extract 320 mg daily for 12 weeks reduces daytime urinary frequency and might improve nocturia, but it does not seem to reduce urinary urgency, incontinence, straining, bladder pain, or urethral pain when compared with placebo (110540).
• Prostate cancer. Small preliminary studies suggest that saw palmetto does not reduce prostate cancer risk or symptoms associated with prostate cancer. Details: Population research shows that people who take saw palmetto supplements do not have a lower risk of developing prostate cancer (15217). Preliminary clinical research also shows that taking saw palmetto 960 mg daily before, during, and after radiation treatment for early prostate cancer does not significantly improve lower urinary tract symptoms when compared with placebo (96412).
• Prostatitis. Adding saw palmetto to antibiotic therapy seems to relieve some symptoms of bacterial prostatitis more effectively than antibiotics alone. Details: Preliminary clinical research in patients with bacterial prostatitis shows that taking saw palmetto extract daily for eight weeks, with prulifloxacin 600 mg daily for 15 days, reduces pain and urinary symptoms more than prulifloxacin alone, but the combination does not appear to improve bacterial eradication or sexual dysfunction more than the antibiotic alone (89442). One small clinical study in patients with chronic nonbacterial prostatitis shows that a specific saw palmetto extract (Prostamol Uno, Profluss) 320 mg daily improves symptoms when compared with no treatment (73329). Combinations of saw palmetto with other supplements have also been used with fluoroquinolone antibiotics, typically resulting in symptom improvement when compared with the antibiotic alone. These supplement combinations include saw palmetto, indole-3-carbinol, and epigallocatexin-3-gallate (Indigal Plus) 2 capsules twice daily for 3 months (73355); saw palmetto 160 mg, stinging nettle 120 mg, curcumin 200 mg, and quercetin 100mg (ProstaMEV plus FlogMEV) for 2 weeks (73346); and saw palmetto 320 mg, Bacillus coagulans 200 mg, and arbutin 100 mg (Lactorepens) daily for 30 days (96411).
• Sexual desire. Although there has been interest in using oral saw palmetto for sexual desire, there is insufficient reliable information about the clinical effects of saw palmetto for this purpose.
• Sexual dysfunction. Although there has been interest in using oral saw palmetto for sexual dysfunction, there is insufficient reliable information about the clinical effects of saw palmetto for this purpose. More evidence is needed to rate saw palmetto for these uses.

(Read more about SAW PALMETTO)

POSSIBLY INEFFECTIVE

• Urinary tract infections (UTIs). Clinical research does not support the use of oral uva ursi for treatment of UTIs. For prevention of UTIs, oral uva ursi has only been evaluated in combination with other ingredients; its effect when used alone is unclear. Details: A large clinical study in females with uncomplicated UTI shows that taking uva ursi tablets providing 210 mg arbutin orally three times daily for 5 days is less effective than a single dose of fosfomycin 3 grams for reducing UTI symptom burden and the number of rescue antibiotic courses. Rescue antibiotics were needed in 44% of patients receiving uva ursi, compared with 23% of those receiving fosfomycin. On day 4, the percentage of patients with symptom resolution was 49% with uva ursi, compared to 65% with fosfomycin. Pyelonephritis occurred in 8 patients on uva ursi and 2 patients on fosfomycin (109535). Also, a large clinical study in females experiencing symptoms of a UTI shows that taking uva ursi extract 1200 mg three times daily for 3-5 days does not improve symptoms or reduce the need for antibiotics when compared with placebo (101815). Uva ursi has also been evaluated for the prevention of UTIs. One small clinical study in females with recurrent UTI shows that taking a specific combination product containing uva ursi and dandelion (UVA-E, Medic Herb AB) 3 tablets three times daily for one month reduces the recurrence rate of UTIs when compared with placebo (1932). It is not clear if this effect is due to uva ursi, dandelion, or the combination.

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Benign prostatic hyperplasia (BPH). Although there is interest in using oral uva ursi for BPH, there is insufficient reliable information about the clinical effects of uva ursi for this condition.
• Bronchitis. Although there is interest in using oral uva ursi for bronchitis, there is insufficient reliable information about the clinical effects of uva ursi for this condition. More evidence is needed to rate uva ursi for these uses.

(Read more about UVA URSI)

LIKELY SAFE ...when used orally and appropriately in amounts commonly found in foods.

POSSIBLY SAFE ...when the seed or seed oil is used orally and appropriately in medicinal amounts, short-term. Pumpkin seed has been used with apparent safety in a dose of up to 10 grams daily for up to 12 months (92383). Pumpkin seed oil has been used with apparent safety in a dose of up to 400 mg daily for up to 6 months (92378). There is insufficient reliable information available about the safety of pumpkin seed oil when used topically.

PREGNANCY AND LACTATION:
Insufficient reliable information available; avoid using amounts greater than those found in food.

(Read more about PUMPKIN)

LIKELY SAFE ...when used orally and appropriately. Saw palmetto has been safely used in clinical studies lasting up to 3 years (2735,6750,6752,6764,6772,6773,11354,14274,15550,17202,17306,17684,73315,73383,73384,73385,73389,89441,96410,96412,110540).

POSSIBLY SAFE ...when used rectally and appropriately. Saw palmetto has been used safely in clinical research at a dose of 640 mg once daily for 30 days (73387). However, the long-term safety of saw palmetto administered rectally is not known.

PREGNANCY AND LACTATION: LIKELY UNSAFE
when used orally. Saw palmetto has hormonal activity (6766); avoid using.

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POSSIBLY SAFE ...when used orally and appropriately, short-term. Uva ursi has been used with apparent safety in doses of up to 3600 mg daily for 3-5 days (101815).

POSSIBLY UNSAFE ...when used orally long-term or in high doses. There is concern about the safety of long-term or high-dose use because of the hydroquinone content of uva ursi. Hydroquinone is thought to have mutagenic and carcinogenic effects (7). At high doses (around 20 grams of dried herb) it can cause convulsions, cyanosis, delirium, shortness of breath, and collapse. At very high doses (30 grams of dried herb or more) it can be fatal (4).

CHILDREN: POSSIBLY UNSAFE
when used orally by children. Uva ursi contains hydroquinone and high tannin levels, which can cause severe liver problems in children (4,18); avoid using.

PREGNANCY: LIKELY UNSAFE
when used orally. Uva ursi can have oxytocic effects, increasing the speed of labor (4,7,19); avoid using.

LACTATION:
Insufficient reliable information available; avoid using.

(Read more about UVA URSI)

LITHIUM Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Probable •  Level of Evidence = D Pumpkin might reduce excretion and increase levels of lithium.  Details Pumpkin is thought to have diuretic properties (92383). Theoretically, this might reduce excretion and increase levels of lithium. The dose of lithium might need to be decreased.

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ANTICOAGULANT/ANTIPLATELET DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Saw palmetto might increase the risk of bleeding with anticoagulant or antiplatelet drugs.  Details Saw palmetto is reported to prolong bleeding time (8659). Theoretically, it might increase the risk of bleeding when used concomitantly with anticoagulant or antiplatelet drugs.

CONTRACEPTIVE DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = B Saw palmetto might reduce the effectiveness of contraceptive drugs.  Details Saw palmetto might have antiestrogenic effects (6766). Theoretically, it might interfere with contraceptive drugs taken concomitantly.

ESTROGENS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = B Saw palmetto might reduce the effectiveness of estrogens.  Details Saw palmetto might have antiestrogenic effects (6766). Theoretically, it might interfere with estrogens taken concomitantly.

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CYTOCHROME P450 2C19 (CYP2C19) SUBSTRATES Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, uva ursi may decrease the metabolism of CYP2C19 substrates.  Details In vitro, uva ursi appears to inhibit cytochrome CYP2C19 (98550). This effect has not been reported in humans.

CYTOCHROME P450 3A4 (CYP3A4) SUBSTRATES Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, uva ursi may decrease the metabolism of CYP3A4 substrates.  Details In vitro, uva ursi appears to inhibit CYP3A4 (98550). This effect has not been reported in humans.

GLUCURONIDATED DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, uva ursi may increase levels of drugs metabolized by glucuronidation.  Details In vitro, uva ursi extract appears to strongly inhibit UDP-glucuronosyltransferase (UGT) 1A1 (UGT1A1). However, uva ursi extract does not appear to inhibit UGT1A1 in animal models (98549). This effect has not been reported in humans.

LITHIUM Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Probable •  Level of Evidence = D Theoretically, uva ursi may increase lithium levels, necessitating a decrease in dose.  Details Uva ursi may have diuretic properties (81637). Diuretics may increase lithium reabsorption with sodium in the proximal tubule of the kidney. Theoretically, uva ursi might reduce excretion and increase levels of lithium.

P-GLYCOPROTEIN SUBSTRATES Interaction Rating = Minor Be watchful with this combination. Severity = Mild •  Occurrence = Possible •  Level of Evidence = D Theoretically, uva ursi may alter the levels of drugs transported by P-glycoprotein.  Details In vitro, uva ursi appears to inhibit the multi-drug transporter protein, P-glycoprotein (98550). This effect has not been reported in humans.

URINARY ACIDIFYING AGENTS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Effects of uva ursi in the urinary tract may be reduced by urinary acidifying agents.  Details Uva ursi seems to work best in alkaline urine. Theoretically, taking uva ursi with medications known to acidify the urine may decrease any effects of uva ursi on the urinary tract (19).

(Read more about UVA URSI)

General ...Orally, pumpkin products are generally well tolerated.
Most Common Adverse Effects:
Orally: Abdominal discomfort, diarrhea, nausea, and vomiting.
Serious Adverse Effects (Rare):
Orally: Anaphylaxis.

Dermatologic ...There are two case reports of adult females developing substantial transient hair loss 1-3 weeks after consumption of a meal containing either bitter-tasting pumpkin or undefined squash. This adverse effect was attributed to a high concentration of cucurbitacin, which is commonly found in wild pumpkins (104535).

Gastrointestinal ...Orally, pumpkin seed oil has been reported to cause mild abdominal discomfort in clinical trials (5093,92378). There are also two case reports of adults developing severe nausea, vomiting, and diarrhea following consumption of a meal containing either bitter-tasting pumpkin or undefined squash. These adverse effects were attributed to a high concentration of cucurbitacin, which is commonly found in wild pumpkins (104535).

Immunologic ...Orally, pumpkin seed oil and pumpkin pulp have been reported to cause anaphylactic reactions in children and adults. A case review highlights 4 cases of anaphylaxis in children (3 from pumpkin pulp, 1 from pumpkin seeds), and 7 cases in adults (1 from pumpkin flesh, 6 from pumpkin seeds). Symptoms of anaphylaxis include urticaria, angioedema of the lips or face, dyspnea, dysphagia, and oropharyngeal itching and swelling. A case report describes a 2-year-old male presenting with urticaria, swollen lips, and increased dyspnea 10 minutes after ingesting pumpkin seeds. The patient was found to have elevated allergen-specific immunoglobulin E (IgE) and a positive skin-prick test for pumpkin seeds. Symptoms resolved after treatment with epinephrine, systemic glucocorticoids, salbuterol, and antihistamines (107843).
There may also be concern for allergic reaction due to inhalation or topical exposure. One case report describes an 8-year-old child developing anaphylaxis while carving a pumpkin; another highlights that inhalation of pumpkin seed flour may have potentiated anaphylaxis in 3 individuals following the ingestion of pumpkin seeds (107843). Further research is necessary to assess the relationship between anaphylaxis and route of administration.

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General ...Orally, saw palmetto is well tolerated and adverse effects are mild, infrequent, and reversible.
Most Common Adverse Effects:
Orally: Abdominal pain, constipation, decreased libido, diarrhea, dizziness, fatigue, headache, nausea, rhinitis, vomiting.

Cardiovascular ...Occasionally, cases of hypertension, postural hypotension, tachycardia, angina pectoris, arrhythmia, extrasystole, angiopathy, myocardial infarction, and congestive heart failure have been reported in patients using saw palmetto orally (6424,6484,6752,6772,17684,73388,89441). One case of severe bradycardia and second degree heart block was reported in a 64 year-old male taking an unknown amount of saw palmetto for a few weeks (96413).

Dermatologic ...A case report describes a 61-year-old male who developed a fixed drug eruption with localized blisters and erosions three days after starting oral saw palmetto. The lesions resolved when saw palmetto was stopped, but recurred when it was reintroduced six months later. Topical corticosteroid treatment was necessary and the patient was left with some residual hyperpigmented patches (104805). A combination of saw palmetto and beta-sitosterol has been associated with a single report of worsening acne (15550).

Endocrine ...Two case reports involving one 11-year-old female undergoing treatment for telogen effluvium and another 10-year-old female undergoing treatment for hirsutism, describe hot flashes and the onset of menarche associated with use of saw palmetto. One of these patients was consuming saw palmetto in a food supplement; the other was taking a supplement containing saw palmetto 320 mg daily (73361,96414). In both cases, the hot flashes resolved following treatment discontinuation. In one case, a rechallenge with saw palmetto caused a recurrence of hot flashes.

Gastrointestinal ...Gastrointestinal complaints such as nausea, vomiting, constipation, diarrhea, gastralgia, and halitosis are the most frequently reported adverse effects associated with saw palmetto (6484,6752,60442,73315,73320,73348,73354,73383,73385,73388,89441). Less often, cases of duodenal ulcer, dyspepsia, or heartburn have been reported (6772,73329,73354). Meteorism (intestinal gas accumulation) has also been reported with saw palmetto, although causality was unclear (60442).

Genitourinary ...Some clinicians are concerned that saw palmetto might cause erectile dysfunction, ejaculatory disturbance, or altered libido because of its potential effects on 5-alpha-reductase. Some preliminary clinical studies have reported sexual dysfunction, particularly ejaculatory dysfunction, erectile dysfunction, and reduced libido, in patients taking saw palmetto (5093,17202,17684,73383,89441). However, most of these patients were previously diagnosed with prostate disorders, so causality is unclear. Additionally, several clinical studies indicate that the occurrence of impotence in males taking saw palmetto is similar to placebo and tamsulosin (Flomax), and significantly less than finasteride (Proscar) (2732,6424,17306,107481). Rarely, cases of testicular pain, vesical tenesmus, and urinary tract infections have been reported in patients using saw palmetto extract orally (73388).

Hematologic ...Saw palmetto might have antiplatelet effects and potentially increase the risk of bleeding in some patients. There is one report of excessive intraoperative bleeding in a patient who took saw palmetto prior to surgery. Bleeding time normalized when saw palmetto was discontinued (8659). Also, one case of cerebral hemorrhage has been reported, but details are not available to determine causality (6772,73348). A case of retroperitoneal hematoma after bilateral inguinal hernia repair is reported in a male patient taking saw palmetto. The patient was discharged after a 3-day hospitalization in stable condition (112177).

Hepatic ...A case report describes a patient who developed acute hepatitis and pancreatitis while taking saw palmetto. Symptoms resolved when saw palmetto was discontinued, and reemerged upon re-challenge (14457). Other cases of acute hepatitis and pancreatitis, with elevated alkaline phosphatase, aspartate aminotransferase (AST), alanine aminotransferase (ALT), and bilirubin have been reported in patients using saw palmetto orally (14457,73350,73351).

Musculoskeletal ...Orally, saw palmetto may cause fatigue, weakness, muscle pain, and back pain, although these adverse events are rare (6424,73388,89441). A case of saw palmetto-related rhabdomyolysis was reported in an 82-year-old male presenting with kidney dysfunction, increased C-reactive protein levels, and elevated serum creatine kinase (73358).

Neurologic/CNS ...Orally, saw palmetto can cause headaches, dizziness, insomnia, and fatigue (6750,6752,6772,11354,60442,73348,73385,73388,89441).

Ocular/Otic ...A case of intraoperative floppy-iris syndrome (IFIS) has been reported in a patient using saw palmetto orally (73340). However, no statistically significant association between saw palmetto and IFIS was found in a case series of 660 patients undergoing cataract surgery (73347).

Pulmonary/Respiratory ...Rhinitis is one of the more commonly reported adverse effects of saw palmetto (73348). One patient taking saw palmetto extract 160 mg twice daily reported "breathlessness" (73388). Two cases of respiratory depression have been reported in patients using saw palmetto extract (Permixon) 320 mg (6772).

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General ...Uva ursi is generally well tolerated in low doses, short-term.
Most Common Adverse Effects:
Orally: Diarrhea, nausea, stomach upset, and vomiting.
Serious Adverse Effects (Rare):
Orally: At high doses (20 grams of dried herb), uva ursi has been reported to cause collapse, convulsions, cyanosis, delirium, shortness of breath, and tinnitus. Very high doses of 30 grams or more may be fatal.

Gastrointestinal ...Orally, uva ursi may cause nausea, vomiting, diarrhea, and stomach upset (92148). It can also irritate the gastrointestinal tract (19).

Genitourinary ...Orally, uva ursi may cause the urine to be greenish-brown. It may also cause irritation and inflammation of the urinary tract mucous membranes (18).

Hepatic ...Uva ursi may be hepatotoxic. Theoretically, chronic use, especially in children, can cause liver impairment due its hydroquinone and high tannin content (4,18).

Neurologic/CNS ...Orally, around 20 grams of uva ursi is reported to supply up to one gram of hydroquinone, which can theoretically cause convulsions and delirium (4).

Ocular/Otic ...Orally, uva ursi may potentially cause retinal toxicity due to its hydroquinone content, which reduces melanin synthesis. A 56-year-old female developed bilateral bull's-eye maculopathy, paracentral scotomas, and retinal thinning after 3 years of uva ursi tea ingestion (16900).
Taking around 20 grams of uva ursi orally is reported to supply up to one gram of hydroquinone, which can theoretically cause tinnitus (4).

Pulmonary/Respiratory ...Orally, around 20 grams of uva ursi is reported to supply up to one gram of hydroquinone, which can theoretically cause shortness of breath and cyanosis (4).

(Read more about UVA URSI)