Tranexamic acid is a man-made form of an amino acid (protein) called lysine. Tranexamic acid prevents enzymes in the body from breaking down blood clots. Cyklokapron is used to prevent bleeding in people with hemophilia who need to have a tooth pulled. This medication is usually given just before the dental procedure, and daily for up to 8 days afterward. Tranexamic acid may also be used for purposes not listed in this medication guide.