Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Stop using Ginkgo Biloba and call your healthcare provider at once if you have:
easy bruising, unusual bleeding (nose, mouth, vagina, or rectum);
any bleeding that will not stop;
a seizure (convulsions); or
weak pulse, weak or shallow breathing, feeling like you might pass out.
Touching or handling Ginkgo Biloba fruit pulp can cause a severe skin reaction including redness, swelling, blistering, and itching for up to 10 days.
In animal studies, Ginkgo Biloba leaf extract increased the risk of thyroid cancer and liver cancer. However, very high doses are used in animal studies. It is not known whether these effects would occur in people using doses recommended for human use.
Common side effects may include:
upset stomach, constipation;
headache, dizziness;
fast or pounding heartbeats;
mouth irritation; or
skin rash.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Ginkgo Biloba side effects (more detail)
