Common side effects associated with using blood thinners for Deep Vein Thrombosis (DVT) include nausea, vomiting, dizziness, and headaches. Additionally, these medications may increase your risk of bleeding, so it is important that you speak to your doctor before starting any course of medication in order to understand the benefits and risks involved. Your doctor will be able to provide detailed information about potential side effects so that you can make an informed decision about what’s best for you or your loved one.