Short answer: Anticoagulants or antiplatelet medicines such as warfarin, or regular aspirin — ginkgo may increase bleeding risk, a direct, specific medication caution.
Why naming warfarin and aspirin specifically matters
Rather than a vague "blood thinner" caution, naming these two specific, commonly used medications gives you something concrete to check against your own regimen.
Why this caution extends to a specific pre-surgical instruction
Anyone with a bleeding disorder or scheduled for surgery should avoid ginkgo — stop before planned surgery, a direct, actionable instruction worth planning around.
💊 Worth knowing: never eat raw or roasted ginkgo seeds — a genuinely separate, additional caution worth being aware of.