TRANEXAMIC ACID TABLETS 500MG

Indications

• Heavy menstrual bleeding (menorrhagia)
• Surgical procedures to reduce blood loss
• Trauma-related bleeding
• Hereditary angioedema
• Dental procedures in patients with bleeding disorders

Dosage

Children: Refer to the BNF for Children for specific dosing guidelines based on age, weight, and indication.

Adults: Refer to the BNF for specific dosing guidelines based on indication and patient condition.

Mechanism of action

Tranexamic acid competitively inhibits the lysine binding sites on plasminogen, preventing its conversion to plasmin. This inhibition decreases fibrinolysis, leading to increased clot stability and reduced bleeding.

Pharmacodynamics

The primary pharmacodynamic effect of tranexamic acid is its ability to reduce bleeding by stabilizing fibrin clots. The drug exhibits a dose-dependent effect on clotting, with higher doses leading to a more pronounced antifibrinolytic effect. Tranexamic acid does not significantly affect platelet function or coagulation factors.

Pharmacokinetics

Tranexamic acid is rapidly absorbed after oral administration, with peak plasma concentrations occurring within 1 to 3 hours. It has a bioavailability of approximately 30% to 50%. The drug is primarily excreted unchanged in the urine, with a half-life of approximately 2 hours. It does not undergo significant metabolism in the liver, which is beneficial in patients with hepatic impairment.

Contra-indications

• Active venous thromboembolism
• History of thromboembolic disorders
• Severe renal impairment
• Hypersensitivity to tranexamic acid or any excipients

Adverse effects

• Nausea
• Vomiting
• Diarrhea
• Abdominal pain
• Dizziness
• Headache
• Visual disturbances
• Thrombosis
• Hypotension
• Allergic reactions

Interactions

• Anticoagulants (increased risk of thrombosis)
• Hormonal contraceptives (increased risk of thrombosis)
• Fibrinolytics (increased risk of bleeding)

Precautions

• Monitor for signs of thrombosis during treatment
• Use with caution in patients with a history of seizures
• Caution in patients with renal impairment
• Assess the risk of bleeding before use

Pregnancy

Tranexamic acid should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

Tranexamic acid is excreted in breast milk; caution should be exercised when administered to nursing mothers.

Storage

Store at room temperature, away from moisture and direct sunlight. Keep out of reach of children.

Formulations

• Tablets
• Injection solution