Ginkgo biloba is toxic, eating too much will be poisoned, triggering muscle convulsions, pupil dilation. Ginkgo biloba contains a large amount of ginkgolic acid, ginkgolic acid is toxic, generally harvested leaves are not y processed and concocted, fresh leaves contain ginkgolic acid content of up to 3,000-4,000 ppm. due to the ginkgolic acid is water-soluble, which has medicinal value of ginkgolides and other fat-soluble, soak the water to drink will lead to the dissolution of the toxic substances, drinking is easy to cause poisoning. Ginkgo biloba's main ingredient flavonoids is a powerful platelet activating factor inhibitor, long-term use may inhibit platelet coagulation function, and accordingly increase the risk of cerebral hemorrhage. Therefore, the elderly should take ginkgo biloba to stop, and pay attention to regular testing of blood clotting, do not blindly long-term use. For the elderly vascular sclerosis, blood vessels become brittle patients, more can not take long-term, so as not to cause cerebral hemorrhage.