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However, some types of horny goat weed are POSSIBLY UNSAFE when used for a long period of time or in high doses. Long-term use of these other forms of horny goat weed might cause dizziness, vomiting, dry mouth, thirst, and nosebleed. Taking large amounts of horny goat weed might cause spasms and severe breathing problems.
A heart arrhythmia has also been reported in a man who took horny goat weed in a commercial product used for sexual enhancement. Research also shows that a specific multi-ingredient commercial product (Enzyte, Berkeley Premium Nutraceuticals) that contains horny goat weed might cause abnormal heart beats when measured by an electrocardiogram. These changes might increase the chance of having a heart arrhythmia. However, since these products contain multiple ingredients, it is not clear if these effects are caused by horny goat weed or other ingredients.
Special Precautions & Warnings:Pregnancy and breast-feeding: Horny goat weed is POSSIBLY UNSAFE when taken by mouth during pregnancy. There is a concern that it might harm the developing fetus. Avoid using it. Not enough it known about the safety of using horny goat weed during breast-feeding. Stay on the safe side and avoid using.
Bleeding disorders: Horny goat weed slows blood clotting and might increase the risk of bleeding. However, it is not known if this is a big concern. In theory, taking horny goat weed might make bleeding disorders worse.
Hormone sensitive cancers and conditions: Horny goat weed acts like estrogen and can increase estrogen levels in some women. Horney goat weed might make estrogen-sensitive conditions, such as breast and uterine cancer, worse.
Low blood pressure: Horny goat weed might lower blood pressure. In people who already have low blood pressure, using horny goat weed might drop blood pressure too low and increase the risk of fainting.
Surgery: Horny goat weed slows blood clotting and might increase the risk of bleeding during surgery.
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.