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The Side Effects of Damiana Leaves

author image Linda Tarr Kent
Linda Tarr Kent is a reporter and editor with more than 20 years experience at Gannett Company Inc., The McClatchy Company, Sound Publishing Inc., Mach Publishing, MomFit The Movement and other companies. Her area of expertise is health and fitness. She is a Bosu fitness and stand-up paddle surfing instructor. Kent holds a bachelor's degree in journalism from Washington State University.
The Side Effects of Damiana Leaves
Damiana leaf can depress blood glucose levels dangerously low. Photo Credit Steve Gorton/Dorling Kindersley/Getty Images


Damiana leaf is popular for its purported aphrodisiac and antidepressant properties, and it is sometimes used to boost physical and mental capacity and as an aid in times of physical exertion. It’s also used in folkloric medicine to treat diabetes, inflammation and kidney ailments. However, no research documents such effects in humans, according to “The Complete Commission E Monographs,” by Mark Blumenthal. Some people use it to gain an herbal “high,” according to Drugs.com. You can find it in tea, capsule and bulk herb powder forms, or in damiana liqueur. Therapeutic doses have few side effects, but large doses may be dangerous.

Convulsions in High Doses

High doses of damiana may cause convulsions that are similar to those caused by tetanus, according to “The Essential Herb-Drug-Vitamin Interaction Guide” by George T. Grossberg and Barry Fox. There’s no official recommendation for damiana dosage due to lack of scientific study, according to Blumenthal. However, traditional dosages are 2 to 4g of dried damiana leaf taken three times a day, according to Grossberg and Fox.

Blood Sugar Effect

If you are diabetic, consult a doctor before trying damiana. It may increase your risk of becoming hypoglycemic, meaning your blood-sugar levels will fall too low, if you take it along with certain drugs meant to control blood sugar, including insulin, according to Grossberg and Fox.

Pregnancy Concerns

If you are pregnant or nursing, it’s best to avoid damiana leaf, advises Drugs.com. In high doses, there is a risk of cyanide toxicity. This is due to cyanogenetic glycosides, which are components found in damiana leaf. These phytotoxins are present in many foods we safely eat, including lima beans and almonds, though high levels are dangerous, according to the National Institute of Public Health and Environmental Protection.

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