The dosage of TXA is determined based on the person’s weight and the severity of the bleeding. If TXA  is given by injection, it will start working within 5 minutes. The first dose is  10 – 20 mg of TXA  followed by another dose of 10 – 20 mg after an hour. It lasts for 15-20 hours. The 500 mg tablets are taken 2-3 tbl, 3 times a day for adults, and the 1000 mg tablets are taken 2-3 times (2 tablets). The dosage is lower for those experiencing kidney problems.