Scientific Name(s): Turnera diffusa Willd. ex Schult., Turnera diffusa Willd. ex Schult. var. aphrodisiaca (G.H. Ward) Urb., Turnera diffusa Willd. ex Schult. var. diffusa
Common Name(s): Damiana, Herba de la pastora, Mexican damiana, Old woman's broom, Rosemary
Clinical studies evaluating the effect of T. diffusa are lacking. Studies in rodents suggest damiana has aphrodisiac and anxiolytic effects.
There are no recent clinical studies of damiana to provide dosage recommendations. Traditionally, damiana extract British Pharmaceutical Codex (BPC) has been used at a dosage of 0.3 to 0.6 g.
Contraindications have not been identified.
Avoid use. Documented adverse effects include cyanogenic glycosides and risk of cyanide toxicity with high doses of damiana.
None well documented.
There is limited clinical information regarding adverse reactions associated with damiana use. The possibility of convulsions, especially in relation to excess alcohol consumption, exists. Damiana-induced hallucinations are unlikely.
Research reveals little or no information regarding toxicity with damiana use. T. diffusa contains potentially toxic chemicals including arbutin, tannins, and cyanogenic glycosides.
- Turneraceae (turnera)
Damiana is a Mexican shrub also found throughout the southern United States and South America. It has small, yellow-brown, aromatic leaves that are used medicinally when dried. The leaves are broadly lanceolate, 10 to 25 mm in length and with 3 to 6 teeth along the margins. The red-brown twigs are often found mixed in the crude drug along with its spherical fruits.Khan 2009, USDA 2015 A synonym includes Turnera microphalli.
Aphrodisiac properties of the plant have been described for more than 300 years.Rowland 2003 It was traditionally used by the Mayans to treat giddiness and balance problems and to regain strength after alcoholic and sexual excesses.Szewczyk 2014 Atlas de las Plantas de la Medicina Tradicional Mexicana lists damiana as a remedy for stomachache, tobacco-related lung disease, bladder and kidney infections, rheumatism, diabetes, and scorpion stings.Duke 2002, Khan 2009, Szewczyk 2014
Damiana was included in the first edition of the National Formulary (NF) in 1888 as an elixir and fluid extract. However, it was never included in the US Pharmacopeia and the elixir was removed from the NF in 1916. The fluid extract and the crude drug (leaves) were listed in the NF until 1947.Szewczyk 2014 Today, damiana's popularity is related to its purported aphrodisiac and hallucinogenic properties, despite a lack of documented evidence.Rowland 2003
Alkaloids, cyanogenic glycosides, steroids, saponins, flavonoids, tannins, carbohydrates (saccharides), and proteins have been identified in the plant.Khan 2009, Kumar 2006, USDA 2015 Damiana contains a complex volatile oil (0.5% to 1%) that gives the plant its characteristic odor and taste. Analysis of the oil has identified a low boiling point fraction composed mainly of 1,8-cineol and pinenes, and a higher boiling point fraction consisting primarily of thymol and sesquiterpenes (including copaene, cadinene, and calamenene).Alcaraz-Meléndez 2004, Khan 2009 In addition, the plant contains gonzalitosin, damianin (a bitter, brown cyanogenic glycoside), apigenin, and arbutin.Khan 2009, Kumar 2008 Methods of damiana leaf analysis and quantification have been defined.Kumar 2008, Szewczyk 2014
Uses and Pharmacology
In studies of rodents, antiaromatase activity was demonstrated with damiana extract, indicating a possible role in maintaining testosterone levels and suppressing estrogen.Szewczyk 2014, Zhao 2007 Limited studies in rodents have demonstrated positive effects of T. diffusa on sexual behavior.Estrada-Reyes 2009, Estrada-Reyes 2013, Szewczyk 2014, Zhao 2008
An anxiolytic effect has been reported in mice given 25 mg/kg orally of a methanol extract of the aerial plant parts of T. diffusa. The effect was reported to be similar to oral diazepam 2 mg/kg.Arletti 1999, Kumar 2005 In further studies, apigenin 2 mg/kg extracted from damiana exhibited anxiolytic and analgesic effects in mice. At higher dosages, apigenin extract produced sedative effects.Kumar 2005, Sarris 2013 In the hippocampus of rats, a hydroalcoholic extract of T. diffusa had no effect on cell death (apoptosis).Kumar 2005
Research reveals no clinical data regarding the use of damiana for CNS effects, nor as a hallucinogen.
Clinical studies of damiana do not provide a basis for dosage recommendations.
Pregnancy / Lactation
Avoid use. Documented adverse effects include cyanogenic glycosides and risk of cyanide toxicity with high doses of damiana.Duke 2002
The possibility of convulsions, especially in relation to excess alcohol consumption, exists.Duke 2002, Szewczyk 2014 Damiana-induced hallucinations are unlikely. Damiana may have anxiolytic propertiesDuke 2002, Szewczyk 2014 and the leaves may have a laxative effect.Duke 2002 Reports of urethral mucosa irritation, which could be mistaken for increased sexual sensitivity, may contribute to the belief in damiana's aphrodisiac effects.Tyler 1983
Research reveals little or no information regarding toxicity with damiana use. No acute toxicity was found in mice administered damiana 1 g/kg orally; however, damiana 100 mg/kg administered intraperitoneally induced abdominal contractions in mice.Szewczyk 2014 T. diffusa contains potentially toxic chemicals including arbutin, tannins, and cyanogenic glycosides.Szewczyk 2014
- Turnera microphalli
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