What could happen from an overdose of blood thinner?

Bleeding: If you are referring to warfarin, it can cause severe bleeding. If aspirin, bleeding and kidney problems. Be very careful with all blood thinners. One needs to be monitored for symptoms and signs of bleeding. If there are concerns, contact your provider.

↑ed Bleeding NotThin: Blood viscosity is primarily due to surface adhesiveness of red blood cells. Blood viscosity is ↓ed in anemia (RBCs farther apart), but this is not healthy. All the agents commonly referred to as "thinners" either ↓ blood clotting or stimulate blood clot destruction proteins. Thus all are anti-clotting agents, do not ↓ blood viscosity; are recommended to ↓ clots inside blood vessels, & ↑ bleeding.