Goat weed, commonly called horny goat weed, has traditionally been used in Asia for treating kidney and liver disorders, as well as joint problems and other health conditions. In other parts of the world, people mainly use goat weed as an aphrodisiac and to treat erectile dysfunction, and as a stimulant. Very few side effects are associated with this herb, and most people do not experience any.
Increased Bleeding
Goat weed may increase the risk of abnormal bleeding, including internal bleeding, according to EMedTV. This is most likely in people with bleeding disorders or who take anticoagulant medications such as warfarin. Signs of abnormal bleeding include frequent nosebleeds, easy bruising, bleeding that takes a long time to stop, black tarry stools or blood in the stool and vomiting blood.
Stimulant Effects
Because of its stimulant properties, high doses of goat weed may cause a rapid heart rate or other heart rhythm disturbances, according to Ray Sahelian, a physician who specializes in natural supplements. This effect also may occur if people take goat weed daily in moderate doses without a break. Additionally, the stimulant quality may cause insomnia, even if a person only takes goat weed in the morning.
Allergic Reaction
As with other herbs, some people may have an allergic reaction to goat weed. Signs include a rash or hives, itching, wheezing or trouble breathing, difficulty swallowing and facial or mouth swelling. Signs of an allergy to goat weed call for immediate medical attention.
Minor Side Effects
Other side effects sometimes associated with goat weed use are relatively minor, as noted by EMedTV. They include dizziness, dry mouth, thirst and vomiting.
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