Macuna pruriens Extract by Barlowe's Herbal Elixirs

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Anxiety. Although there has been interest in using oral cowhage for anxiety, there is insufficient reliable information about the clinical effects of cowhage for this purpose.
• Erythema. Although there has been interest in using topical cowhage for erythema, there is insufficient reliable information about the clinical effects of cowhage for this purpose.
• Hyperprolactinemia. Although there has been interest in using oral cowhage for hyperprolactinemia, there is insufficient reliable information about the clinical effects of cowhage for this purpose.
• Myalgia. Although there has been interest in using topical cowhage for myalgia, there is insufficient reliable information about the clinical effects of cowhage for this purpose.
• Parkinson disease. It is unclear if oral cowhage is beneficial in patients with Parkinson disease. Details: Very small clinical studies in patients with Parkinson disease suggest that taking a specific cowhage seed extract standardized to 3.3% levodopa (Zandopa, formerly HP-200; Zandu Pharmaceuticals), or other cowhage products that contain levodopa 75-400 mg orally once daily for up to 12 weeks modestly improves Parkinson disease scores when compared with baseline (7020,7203). Two very small clinical trials enrolling a total of 26 patients with Parkinson disease suggests that taking a single dose of cowhage powder, providing levodopa 1000-2000 mg or 12.5-17.5 mg/kg, is similarly effective after 90 minutes when compared with prescription levodopa 200 mg or 3.5 mg/kg as a single dose, with or without carbidopa and benserazide (12232,97266). It is unclear how these products would compare if they provided similar amounts of levodopa, or if they were taken for an extended duration.
• Rheumatoid arthritis (RA). Although there has been interest in using topical cowhage for RA, there is insufficient reliable information about the clinical effects of cowhage for this purpose.
• Sexual desire. Although there has been interest in using oral cowhage to increase sexual desire, there is insufficient reliable information about the clinical effects of cowhage for this purpose. More evidence is needed to rate cowhage for these uses.

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POSSIBLY SAFE ...when used orally and appropriately. Powdered formulations of cowhage seed that are standardized to provide levodopa 75-400 mg daily have been used with apparent safety for up to 20 weeks (7020,7203,97266).

POSSIBLY UNSAFE ...when the hair of the cowhage bean pod is used orally or topically. The bean pod hairs are strong irritants and can cause severe itching, burning, and inflammation (18).

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

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ANESTHESIA Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, concomitant use of cowhage and anesthesia might increase the risk of arrhythmias.  Details Cowhage contains levodopa (7020,7205,46334,46336,94723,94724). Use of levodopa with cyclopropane or halogenated hydrocarbon anesthesia has led to arrhythmias. Other anesthetics have not been implicated (15). Use other anesthetics in patients taking cowhage or tell patients to stop taking cowhage at least 2 weeks before surgery.

ANTIDIABETES DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, concomitant use of cowhage and antidiabetes drugs might increase the risk of hypoglycemia.  Details Animal research shows that cowhage might have hypoglycemic effects (7221).

ANTIPSYCHOTIC DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, use of cowhage might decrease the clinical effects of antipsychotic drugs.  Details Cowhage contains levodopa (7020,7205,46334,46336,94723,94724). Use of levodopa might counteract the antidopaminergic effects of antipsychotic medications (15).

GUANETHIDINE (Ismelin) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Probable •  Level of Evidence = D Theoretically, concomitant use of cowhage and guanethidine might increase the risk of hypotension.  Details Cowhage contains levodopa (7020,7205,46334,46336,94723,94724). Use of levodopa with guanethidine might cause additive hypotension (15); avoid using.

LEVODOPA Interaction Rating = Major Do not take this combination. Severity = Moderate •  Occurrence = Likely •  Level of Evidence = D Concomitant use can increase the risk of levodopa-related adverse effects.  Details Cowhage contains levodopa. Some cowhage products have been standardized to contain 75-400 mg of levodopa per dose (7020,7205,46334,46336,94723,94724).

METHYLDOPA (Aldomet) Interaction Rating = Major Do not take this combination. Severity = High •  Occurrence = Probable •  Level of Evidence = D Theoretically, concomitant use of cowhage and methyldopa might increase the risk of hypotension.  Details Cowhage contains levodopa (7020,7205,46334,46336,94723,94724). Use of levodopa with methyldopa might cause additive hypotension. In addition, methyldopa may inhibit peripheral decarboxylation of levodopa and increase levodopa levels in the central nervous system (15); avoid using.

MONOAMINE OXIDASE INHIBITORS (MAOIs) Interaction Rating = Major Do not take this combination. Severity = High •  Occurrence = Probable •  Level of Evidence = D Theoretically, concomitant use of cowhage and non-selective MAOIs might increase the risk of hypertensive crisis.  Details Cowhage contains levodopa (7020,7205,46334,46336,94723,94724). Use of levodopa with non-selective MAOIs might cause hypertensive crisis. However, this interaction has not been reported with MAO-B selective inhibitors such as selegiline (15).

TRICYCLIC ANTIDEPRESSANTS (TCAs) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, use of TCAs might reduce the levels and clinical effects of cowhage.  Details Cowhage contains levodopa (7020,7205,46334,46336,94723,94724). Use of TCAs might reduce the absorption of levodopa. Some case reports describe patients that developed hypertension and dyskinesia when taking both levodopa and TCAs (15).

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General ...Orally, adverse effects to cowhage seem to be rare; however, a thorough safety evaluation has not been conducted. Topically, cowhage bean pod or seed may be unsafe.
Most Common Adverse Effects:
Orally: Diarrhea, flatulence, mucosal irritation.
Topically: Erythema, pruritus, rash.

Cardiovascular ...Orally, cowhage has been reported to cause palpitations (7021,7203)

Dermatologic ...Orally, ingestion of hairs from the bean pod or seed can result in significant mucosal irritation and should be avoided.
Topically, hairs on cowhage bean pod or seed can cause severe pruritus (6898). Symptoms include severe itching, burning, inflammation, and erythematous macular rashes (18,6898). Symptoms resolve spontaneously within several hours, but may also be relieved with antihistamines (6898). The hairs can be removed from the skin by washing, but the hairs can also be retained, and transferred to other people, in fabrics and carpets. Clothing and other materials that come in contact with cowhage hairs should also be thoroughly washed (6898).

Gastrointestinal ...Orally, cowhage has been reported to cause flatulence, diarrhea, and dry mouth (7021,7203). Orally, a specific powdered cowhage seed extract (Zandopa, formerly HP-200; Zandu Pharmaceuticals) has been reported to cause nausea, abdominal distention, and vomiting in clinical research when taken in amounts of 22.5-67.5 grams divided into 2-5 doses per day (7020).

Musculoskeletal ...Orally, dyskinesia has been reported in clinical research in about 3% of patients taking a specific powdered cowhage seed extract (Zandopa, formerly HP-200; Zandu Pharmaceuticals) 22. 5-67.5 grams divided into 2-5 doses daily (7020).

Neurologic/CNS ...Orally, cowhage has been reported to cause headaches (7021,7203). Orally, insomnia has been reported in clinical research in about 3% of patients taking a specific powdered cowhage seed extract (Zandopa, formerly HP-200; Zandu Pharmaceuticals) 22.5 grams to 67.5 grams divided into 2-5 doses daily (7020).

Psychiatric ...In a case report, cowhage caused an outbreak of acute toxic psychosis. Symptoms of psychosis included confusion, giddiness, agitation, hallucinations, and paranoid delusions. The cowhage-induced psychosis was successfully treated with intravenous chlorpromazine (7021).

Other ...Orally, cowhage has been reported to cause sweating and changes in urine color, (7021,7203). Theoretically, due to the levodopa constituent, cowhage is likely to cause the same adverse effects that have been attributed to purified, prescription levodopa. Some of these side effects include elevated liver enzymes, respiratory disturbances, urinary retention, muscle cramps, and priapism (15). However, these effects have not yet been reported for cowhage.

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