7 days. Seven days of ginkgo leaf extract infusion constitutes a course of treatment. The normal injection procedure is deep intramuscular injection or slow intravenous injection of 5ml of ginkgo leaf extract injection every day or every other day. According to the condition, usually 1-2 times a day, 2-4 pills at a time. If necessary, the dose can be adjusted to 5 pills at a time, 2 times a day.