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Antifibrinolytic drugs and haemostatics

Medical Professionals

Professional Reference articles are designed for health professionals to use. They are written by UK doctors and based on research evidence, UK and European Guidelines. You may find one of our health articles more useful.

Haemostatic agents act to conserve blood but have differing sites of action in the complex pathways determining coagulation and fibrinolysis. Antifibrinolytics inhibit the activation of plasminogen to plasmin, prevent the break-up of fibrin and maintain clot stability. They are used to prevent excessive bleeding.

  • Tranexamic acid is the best known and is used where the risk of haemorrhage is high due to increased fibrinolysis (for example, women with menorrhagia have increased levels of endometrial plasminogen activators compared with those with normal menstrual loss), or short-term following acute haemorrhage.

  • Aprotinin is a proteolytic enzyme inhibitor. It acts on plasmin and kallikrein.

  • Etamsylate is an haemostatic agent and probably works by correcting abnormal adhesion of platelets.

Blood products (antithrombin III, recombinant activated protein C, recombinant factor VIIa, dried factor VIII, IX and XIII fractions, protein C concentrate and fresh frozen plasma) can also be considered haemostatic agents but are beyond the scope of this article. They are either derived from human plasma (carrying a potential risk of unidentified infection) or manufactured using recombinant technology. They are used to correct congenital or acquired clotting abnormalities and are specialist drugs, usually administered under the supervision of a haematologist.

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Tranexamic acid is widely used to treat menorrhagia and is recommended by current National Institute for Health and Care Excellence guidelines as medical treatment where:3

  • There are no structural or histological abnormalities causing the bleeding pattern.

  • Fibroids are less than 3 cm in diameter with no distortion of the uterine cavity.

  • Women are not wishing for a contraceptive or hormonal method (such as the intrauterine system (IUS) or combined oral contraceptive (COC) pill.

It is an effective treatment, reducing blood loss on average by 40-50% but should be discontinued if a woman's menstrual symptoms are not improving after three cycles. Non-steroidal anti-inflammatory drugs may be preferred if dysmenorrhoea is also predominant. It appears to be less effective and with greater side-effects than the intrauterine system (IUS) or endometrial resection, although pharmaceutical treatments for menorrhagia are preferred by a minority of women.4 Etamsylate is only occasionally used to treat menorrhagia.

Primary and secondary prevention of haemorrhage

  • Tranexamic acid is used to treat epistaxis, thrombolytic overdose, surgery (eg, prostatectomy and bladder surgery) and to cover the risk of haemorrhage over dental extractions in haemophiliacs. It is also increasingly being used early in civilian and military trauma.5 6

  • Etamsylate is used to treat periventricular haemorrhage in neonates.

  • Antifibrinolytics are used to conserve blood in patients at high risk of haemorrhage during or after open heart surgery, operative repair of scoliosis,7 in acute promyelocytic leukaemia (where high production of plasmin can cause life-threatening haemorrhage) and in liver transplantation (unlicensed). A Cochrane review found evidence that aprotinin reduced the need for red cell transfusion and re-operation due to bleeding following major surgery.8 Similar trends were seen for tranexamic acid. However, there have been concerns that aprotinin is associated with higher risk of death compared with lysine analogues and this led to its temporary suspension. Tranexamic acid is currently preferred after cardiac surgery.9 Their usefulness in orthopaedic surgery has also been shown with no increase in risk of venous thromboembolism .10

Evidence for use of antifibrinolytics in subarachnoid haemorrhage and bleeding in patients with liver disease is lacking.11 12

Management of bleeding disorders

Desmopressin is used in the management of mild-to-moderate haemophilia and von Willebrand's disease (vWD), as it boosts factor VIII concentration. The treatment of haemophilia should be under the direction of a haematologist.13

A Cochrane systematic review concluded there was not yet enough evidence supporting the use of antifibrinolytics in patients with haemophilia or vWD undergoing minor oral surgery or dental extractions.14

Treatment of hereditary angio-oedema

Tranexamic acid can be used in the treatment of hereditary angio-oedema, although danazol or stanozolol (unlicensed indication and on named patient use only) are the usual preferred options.

Fibrinolytic response testing

Desmopressin is given as a spray (150-microgram spray into each nostril) and blood is sampled after one hour for fibrinolytic activity.


Contra-indications to tranexamic acid include:

Contra-indications to etamsylate include:

Contra-indications to desmopressin include:

  • Cardiac insufficiency.

  • Severe renal impairment.

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Initiation of treatment1

Tranexamic acid:

  • For menorrhagia - 1 g tds for up to four days, starting with commencement of menstruation. Maximum dose of 4 g daily.

  • For hereditary angio-oedema - 1-1.5 g bd-tds daily.


Regular eye examinations and LFTs are recommended during long-term treatment with tranexamic acid for hereditary angio-oedema.

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Complications and reasons to discontinue drug1

  • Stop tranexamic acid if disturbances in colour vision occur.

  • Reduce the dose of tranexamic acid if there is gastrointestinal upset (nausea, vomiting, diarrhoea). These side-effects occur in about 15% of the population and improve with dose reduction.

Further reading and references

  1. British National Formulary (BNF); NICE Evidence Services (UK access only)
  2. Menorrhagia (heavy menstrual bleeding); NICE CKS, February 2024 (UK access only)
  3. Heavy menstrual bleeding: assessment and management; NICE Guideline (March 2018 - updated May 2021)
  4. Marjoribanks J, Lethaby A, Farquhar C; Surgery versus medical therapy for heavy menstrual bleeding. Cochrane Database Syst Rev. 2016 Jan 29;1:CD003855. doi: 10.1002/14651858.CD003855.pub3.
  5. Lewis CJ, Li P, Stewart L, et al; Tranexamic acid in life-threatening military injury and the associated risk of infective complications. Br J Surg. 2016 Mar;103(4):366-73. doi: 10.1002/bjs.10055. Epub 2016 Jan 21.
  6. Edwards S, Smith J; Advances in military resuscitation. Emerg Nurse. 2016 Oct 6;24(6):25-29.
  7. McNicol ED, Tzortzopoulou A, Schumann R, et al; Antifibrinolytic agents for reducing blood loss in scoliosis surgery in children. Cochrane Database Syst Rev. 2016 Sep 19;9:CD006883.
  8. Henry DA, Carless PA, Moxey AJ, et al; Anti-fibrinolytic use for minimising perioperative allogeneic blood transfusion. Cochrane Database Syst Rev. 2011 Mar 16;2011(3):CD001886. doi: 10.1002/14651858.CD001886.pub4.
  9. Hutton B, Joseph L, Fergusson D, et al; Risks of harms using antifibrinolytics in cardiac surgery: systematic review and network meta-analysis of randomised and observational studies. BMJ. 2012 Sep 11;345:e5798. doi: 10.1136/bmj.e5798.
  10. Shu HT, Mikula JD, Yu AT, et al; Tranexamic acid use in pelvic and/or acetabular fracture surgery: A systematic review and meta-analysis. J Orthop. 2021 Dec 2;28:112-116. doi: 10.1016/j.jor.2021.11.018. eCollection 2021 Nov-Dec.
  11. Germans MR, Dronkers WJ, Baharoglu MI, et al; Antifibrinolytic therapy for aneurysmal subarachnoid haemorrhage. Cochrane Database Syst Rev. 2022 Nov 9;11(11):CD001245. doi: 10.1002/14651858.CD001245.pub3.
  12. Marti-Carvajal AJ, Sola I; Antifibrinolytic amino acids for upper gastrointestinal bleeding in people with acute or chronic liver disease. Cochrane Database Syst Rev. 2015 Jun 9;(6):CD006007. doi: 10.1002/14651858.CD006007.pub4.
  13. Guidelines for the use of prophylactic factor replacement for children and adults with Haemophilia A and B; British Society for Haematology (May 2020)
  14. van Galen KP, Engelen ET, Mauser-Bunschoten EP, et al; Antifibrinolytic therapy for preventing oral bleeding in patients with haemophilia or Von Willebrand disease undergoing minor oral surgery or dental extractions. Cochrane Database Syst Rev. 2019 Apr 19;4(4):CD011385. doi: 10.1002/14651858.CD011385.pub3.

Article history

The information on this page is written and peer reviewed by qualified clinicians.

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