TXA is a safe, inexpensive medication that prevents fibrin breakdown.  In traumatic bleeding, it conveys a significant mortality benefit with an impressive NNT for mortality between 7 and 67, depending on injury severity, without apparent serious safety issues.  This benefit is associated with early administration.  TXA should not be given more than three hours after injury as it may increase mortality after this timeframe.  It appears to have equal benefit in a variety of trauma practice environments.