Some people may experience gastrointestinal discomfort or headaches as side effects when using ginkgo preparations. People taking anticoagulant medications should only use ginkgo in consultation with their doctor, as the medicinal plant can increase the effect of the anticoagulants. Likewise, people who have to undergo surgery should discontinue ginkgo beforehand. Pregnant women should refrain from using ginkgo. It is important to note that the above indications for the use of ginkgo are general precautions and that it is always advisable to seek individual advice and recommendations from a doctor or qualified health professional before using ginkgo preparations.