After heart surgery, a drug called tranexamic acid can build up in the fluid around the brain and spinal cord, and this buildup might interfere with brain signals in a way that increases the chance of seizures after surgery.

A medicine called tranexamic acid, at levels found in the spinal fluid after heart surgery, might interfere with a natural calming system in the spinal cord and brain, which could make seizures more likely.

A medicine called tranexamic acid can block certain brain and spinal cord signals by attaching to specific receptors, and it works much better on some types of signals than others — like a key that fits one lock better than another.