What concentration should be used to administer a 2‑gram slow intravenous push of tranexamic acid?

Tranexamic Acid 2g Slow Push Concentration

For a 2-gram slow intravenous push of tranexamic acid, use a concentration of 100 mg/mL (standard formulation), which means administering 20 mL total volume over 10 minutes at a rate not exceeding 1 mL/minute.

Standard Dosing and Concentration

The FDA-approved formulation of tranexamic acid for intravenous use is 100 mg/mL in 10 mL single-dose vials (1000 mg per vial) 1. For a 2-gram dose, you would need two vials (20 mL total volume).

Administration Rate

Critical safety point: The infusion rate should not exceed 1 mL/minute to avoid hypotension 1. For a 2-gram dose (20 mL at 100 mg/mL concentration):

• Minimum administration time: 20 minutes at 1 mL/min
• This is slower than the typical "10-minute" bolus described in trauma guidelines

Context: Trauma Dosing Regimens

The most recent European trauma guidelines 2 and consensus statements 3 consistently recommend:

• 1 gram loading dose over 10 minutes, followed by
• 1 gram infusion over 8 hours

However, emerging evidence suggests higher initial dosing may be beneficial. The STAAMP trial data indicates that repeated dosing up to 3 grams total may be appropriate in hypotensive trauma patients 3. A recent 2025 joint position statement 4 notes that EMS agencies may administer either:

• 1 g IV/IO dose (followed by hospital-based 1 g infusion over 8 hours), OR
• 2 g IV/IO dose as an infusion or slow push

Practical Approach for 2g Dosing

If administering a 2-gram dose as a slow push:

1. Use undiluted 100 mg/mL concentration (two 10 mL vials = 20 mL total)
2. Administer over 20 minutes minimum (1 mL/min rate to prevent hypotension)
3. Can be given as two sequential 1-gram doses over 10 minutes each if preferred
4. Timing is critical: Must be given within 3 hours of injury 5, 2, 5—earlier is better, with benefit decreasing 10% for every 15-minute delay 5

Important Caveats

• Do not exceed 1 mL/min infusion rate to avoid hypotension 1
• Renal dosing adjustments required: For creatinine >1.36 mg/dL, reduce frequency or dose 1
• Maximum safe dose appears to be 4 grams—thromboembolic risk increases significantly above this threshold (HR 5.33) 6
• For intravenous use only—inadvertent neuraxial administration can cause seizures 1

The standard 100 mg/mL concentration should not be diluted for slow push administration, though it may be mixed with electrolyte solutions, carbohydrate solutions, or amino acid solutions if needed for infusion 1. Do not mix with blood products or penicillin-containing solutions 1.