Just like any other food supplement, the ginkgolides too have their fair share of disadvantages. Some of the possible side effects of the supplement include headaches, nausea, allergic skin, digestive problems, muscle weakness, and dizziness. Quite often it may also interfere with the blot clotting mechanism. However, the point to note here is that these side effects occur only if you do not follow the right dosage prescribed by your physician or intake a higher dose without consultation.