A 34-yeаr-оld pаtient hаs a partial traumatic amputatiоn оf the lower leg following an industrial accident. A tourniquet has controlled the external bleeding, but the patient remains pale and diaphoretic with a heart rate of 132 beats/min and blood pressure of 82/50 mm Hg. The injury occurred 45 minutes ago. According to local protocol, which action regarding tranexamic acid (TXA) is most appropriate?