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INSUFFICIENT RELIABLE EVIDENCE to RATE

• Benign prostatic hyperplasia (BPH). Although there is interest in using oral diindolylmethane for BPH, there is insufficient reliable information about the clinical effects of diindolylmethane for this condition.
• Breast cancer. It is unclear if oral diindolylmethane is beneficial in patients at high risk for developing breast cancer. Details: Preliminary clinical research in healthy pre- and post-menopausal patients at high risk for breast cancer due to the BRCA mutation shows that taking diindolylmethane (DIM-Evail, Designs for Health Inc) 100 mg daily for 1 year is associated with a 5% decrease in breast density, as measured by the amount of fibroglandular tissue, when compared with baseline (103830). It is unclear whether this reduces the risk of developing breast cancer. Also, the validity of this finding is limited by the lack of a control group.
• Cervical dysplasia. It is unclear if oral diindolylmethane is beneficial in patients with cervical dysplasia. Details: Clinical research in patients with mild cervical abnormalities shows that taking a specific product (BioResponse-DIM, BioResponse) as 150 mg, providing 45 mg diindolylmethane, daily for 6 months does not improve colposcopy or biopsy results when compared with placebo (93836). Additionally, clinical research in patients with grade 2 or 3 cervical neoplasia shows that taking this same product as 2 mg/kg diindolylmethane daily for 12 weeks does not affect Pap smear, colposcopy, or histology results when compared with placebo; however, both groups showed significant improvements when compared with baseline (47709).
• Colorectal cancer. Although there is interest in using oral diindolylmethane for colorectal cancer, there is insufficient reliable information about the clinical effects of diindolylmethane for this condition.
• Mastalgia. Although there is interest in using oral diindolylmethane for mastalgia, there is insufficient reliable information about the clinical effects of diindolylmethane for this condition.
• Obesity. Although there is interest in using oral diindolylmethane for obesity, there is insufficient reliable information about the clinical effects of diindolylmethane for this condition.
• Premenstrual syndrome (PMS). Although there is interest in using oral diindolylmethane for PMS, there is insufficient reliable information about the clinical effects of diindolylmethane for this condition.
• Prostate cancer. Although there is interest in using oral diindolylmethane for prostate cancer, there is insufficient reliable information about the clinical effects of diindolylmethane for this condition.
• Uterine cancer. Although there is interest in using oral diindolylmethane for uterine cancer, there is insufficient reliable information about the clinical effects of diindolylmethane for this condition. More evidence is needed to rate diindolylmethane for these uses.

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LIKELY SAFE ...when used orally in amounts commonly found in foods. The typical diet supplies 2-24 mg of diindolylmethane daily (7170,7176,7664).

POSSIBLY SAFE ...when used orally and appropriately in medicinal doses. Diindolylmethane has been used with apparent safety at a dose of 45 mg daily for up to 6 months or at a higher dose of 100-140 mg daily for up to 3 months (47709,47729,93836,103830).

POSSIBLY UNSAFE ...when used orally in doses of 600 mg daily. In one clinical study, two cases of grade 3 asymptomatic hyponatremia were associated with taking diindolylmethane 600 mg daily (47729).

CHILDREN: LIKELY SAFE
when used orally in amounts commonly found in foods. The typical diet supplies 2-24 mg of diindolylmethane daily (7170,7176,7664).

PREGNANCY AND LACTATION: LIKELY SAFE
when used orally in amounts commonly found in foods. The typical diet supplies 2-24 mg of diindolylmethane daily (7170,7176,7664). There is insufficient reliable information available about the safety of diindolylmethane when used in amounts greater than those found in foods during pregnancy and lactation; avoid using.

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CYTOCHROME P450 1A2 (CYP1A2) SUBSTRATES Interaction Rating = Minor Be watchful with this combination. Severity = Moderate •  Occurrence = Unlikely •  Level of Evidence = D Theoretically, diindolylmethane might lower serum levels of CYP1A2 substrates.  Details In vitro evidence suggests that diindolylmethane can induce CYP1A2 (7667,47745). Theoretically, it might increase metabolism of CYP1A2 substrates and lower serum concentrations. This interaction has not been reported in humans.

DIURETIC DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = B Theoretically, diindolylmethane might increase the risk of hyponatremia if used with sodium-depleting diuretics.  Details Large doses of diindolylmethane (600 mg daily) have been associated with two cases of asymptomatic hyponatremia in clinical research (47729).

ESTROGENS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, diindolylmethane might increase or decrease the effects of estrogens.  Details Diindolylmethane might have mild estrogenic or antiestrogenic effects (7664). Theoretically, large amounts of diindolylmethane might interfere with hormone replacement therapy.

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General ...Orally, diindolylmethane is generally well tolerated.
Most Common Adverse Effects:
Orally: Diarrhea, gas, headache, nausea, rash, and vomiting.
Serious Adverse Effects (Rare):
Orally: Drug rash with eosinophilia and systemic symptoms (DRESS).

Dermatologic ...Orally, diindolylmethane can cause rash (47615,93836). In one case report, a patient developed drug rash with eosinophilia and systemic symptoms (DRESS) after consuming a product containing diindolylmethane, vitamin E, and broccoli powder. An allergen patch test was positive for diindolylmethane (93840).

Endocrine ...Orally, diindolylmethane was associated with grade 3 asymptomatic hyponatremia in 2 of 4 patients taking 600 mg daily for 28 days in one clinical study. Hyponatremia was not seen in the 8 patients taking diindolylmethane 150-450 mg daily (47729).

Gastrointestinal ...Orally, diindolylmethane can cause nausea, vomiting, diarrhea, and gas (47652,47676,47709,47729,93836).

Genitourinary ...Orally, diindolylmethane can cause the urine to darken (93836).

Hematologic ...In one case report, a 65-year-old male developed a deep vein thromboembolism (DVT) and bilateral pulmonary emboli (PE) within a few weeks of initiating treatment with diindolylmethane. It is unclear if diindolylmethane contributed to this event; the patient was at increased risk for emboli due to his age, weight, tobacco use, and possible history of pulmonary embolism (93835).

Hepatic ...In one case report, a patient developed drug rash with eosinophilia and systemic symptoms (DRESS), involving elevated liver transaminases, after consuming a product containing diindolylmethane, vitamin E, and broccoli powder. An allergen patch test was positive for diindolylmethane (93840).

Immunologic ...In one case report, a patient developed drug rash with eosinophilia and systemic symptoms (DRESS) after consuming a product containing diindolylmethane, vitamin E, and broccoli powder. The patient developed fever, activated lymphocytes, and swollen lymph nodes. An allergen patch test was positive for diindolylmethane (93840).

Musculoskeletal ...Orally, diindolylmethane has been reported to cause arthralgias (47615).

Neurologic/CNS ...Orally, diindolylmethane can cause headache (47652,47676,93836). One case has reported ischemic stroke in a 38-year-old female with a history of a patent foramen ovale (PFO), traumatic subdural hematoma, right partial hemicraniectomy, and use of several supplements, including 200 mg of diindolylmethane daily, vitamin D3, vitamin K2, elderberry, caffeine, and possibly cannabis (112895). It is unclear if diindolylmethane contributed to this event; the patient was at increased risk for stroke due to PFO and other factors.

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