- Be on an ongoing regimen of anti-coagulation therapy (e.g., warfarin) or have taken NSAIDs (e.g. aspirin, ibuprofen) or other substances known to increase coagulation time (e.g. herbal supplements with garlic or Gingko Biloba) within 10 days of undergoing study device injection. Note: Study device injection may be delayed as necessary to accommodate this 10-day wash out period