Tranexamic acid side effects
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tranexamic acid adverse effects
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Tranexamic Acid (TXA) - Side Effects
Tranexamic acid is a synthetic lysine analogue that inhibits fibrinolysis by blocking plasmin-mediated fibrin degradation. It is widely used to reduce blood loss in trauma, surgery, obstetric hemorrhage, heavy menstrual bleeding, epistaxis, and hemoptysis. Overall, it has a good safety profile, but there are several clinically important adverse effects to know.
Gastrointestinal Effects (Most Common)
These are the most frequently reported side effects, especially with oral use:
- Nausea
- Vomiting
- Diarrhea
- Abdominal discomfort
These are generally dose-dependent and mild.
Thromboembolic Events
- TXA is an antifibrinolytic, so theoretical concern exists for DVT, pulmonary embolism, and arterial thrombosis
- Importantly, the large CRASH-2 trial (>20,000 patients) found no significant increase in thromboembolic events (myocardial infarction, stroke, PE, vascular occlusion) compared to placebo - Tintinalli's Emergency Medicine
- Similarly, the WOMAN trial (20,060 patients, postpartum hemorrhage) found no difference in thromboembolic events between TXA and placebo - Miller's Anesthesia, 10e
- However, pre-existing thromboembolic disease is a contraindication to TXA use - Scott-Brown's Otorhinolaryngology
Seizures (Neurological - Important in High-Risk Patients)
- High-dose TXA (especially in cardiac surgery) is associated with dose-dependent seizures, likely through competitive antagonism of GABA-A and glycine receptors in the CNS
- Patients with chronic kidney disease (CKD) are at particular risk because TXA is cleared almost entirely by renal excretion - accumulation leads to unpredictable pharmacokinetics and elevated seizure risk
- Comprehensive Clinical Nephrology specifically warns: "Advanced CKD patients are at particular risk for neurologic side effects of TXA (i.e., seizures)"
Hypotension
- Rapid IV infusion can cause hypotension and bradycardia
- TXA should be infused slowly (not as a bolus) to avoid this
Hypersensitivity / Allergic Reactions
- Rare cases of skin rash, urticaria, and anaphylaxis have been reported
- Contact dermatitis can occur with topical formulations
Visual Disturbances
- Color vision changes and blurring have been reported with long-term use
- Retinal artery occlusion has been described very rarely
Cardiovascular
- No significant increase in MI or stroke in large RCTs at standard doses
- At very high doses used in some cardiac surgery protocols, myocardial infarction has been a concern in older studies
Special Population Concerns
| Population | Risk |
|---|---|
| CKD / Renal impairment | Accumulation -> seizures; dose reduction required |
| Patients with history of DVT/PE | Contraindicated |
| Active thromboembolic disease | Contraindicated |
| Cardiac surgery (high-dose) | Higher seizure risk |
| Pregnancy | Crosses placenta; wait until cord clamped to administer |
Summary of Contraindications
- Active thromboembolic disease (DVT, PE, arterial thrombosis)
- History of severe hypersensitivity to TXA
- Subarachnoid hemorrhage (may cause cerebral edema/ischemia)
- Acquired defective color vision (limits monitoring of ocular toxicity)
Recent Evidence Note
A 2024 Lancet systematic review and IPD meta-analysis on TXA in postpartum hemorrhage (PMID: 39461793) confirmed a reduction in death from bleeding with no increase in thromboembolic adverse events, reinforcing the safety data from CRASH-2.
Bottom line: TXA's most common side effects are GI in nature. Seizures are the most serious adverse effect, occurring particularly with high doses or in renal impairment. Thromboembolic risk, while theoretically plausible, has not been shown to increase in large-scale RCTs at standard doses.
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