This is a preparation of tranexamic acid (trans-4 aminomethyl-cyclohexanecarboxylic acid). Tranexamic acid is a substance endowed with a strong antifibrinolytic action and both in vivo and in vitro it has proved to be 10 times more active than conventional hemostatics, depending on the test. The antihemorrhagic action of tranexamic acid is essentially due to an inhibition of the plasminogen activation of both exogenous activators like streptokinase and endogenous ones like urokinase and the plasminogen tissue activator. This fact is particularly important for the clinical use of Tranexamic Acid, because it ensures an antihemorrhagic activity with an antifibrinolytic mechanism under a variety of conditions.