Tranexamic acid and periods: what to know

During menstruation, the lining of the womb sheds and small blood vessels open. Tranexamic acid slows the breakdown of fibrin, a protein that supports a blood clot, so bleeding can be lighter while the medicine is active. It does not alter the cause of heavy periods and is not a contraceptive. Heavy bleeding can have several causes, including fibroids, adenomyosis, hormonal changes, or a bleeding disorder, so a clinician may need to assess the pattern and check for anaemia.

Take the prescribed form and schedule, usually around the days when your period is heaviest. Do not double a missed dose unless a clinician or pharmacist tells you to. Tell the prescriber about previous blood clots, kidney problems, vision changes, pregnancy, or medicines that affect clotting. Keep a simple record of bleeding, pain, dizziness, and any tablets taken; this can make follow-up more useful. Read the product instructions because formulations and dosing directions differ.

Seek urgent medical help for sudden breathlessness, chest pain, coughing blood, one-sided leg swelling or pain, or a sudden change in vision. Arrange prompt care if bleeding is so heavy that you feel faint, weak, confused, or unable to manage normal activities, or if severe pelvic pain accompanies it. A period that repeatedly disrupts daily life also deserves assessment, even when tranexamic acid reduces the flow.

Ask what pattern of bleeding the medicine is intended to treat, how long to use it during each period, and what to do if bleeding continues. You can also ask whether you need a blood count, an examination, or another treatment for the underlying cause.