Drug interactions
Enoxaparin + Heparin
Severity: Major
Enoxaparin and Heparin: major interaction.
Last updated Sources: UK SmPC
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Using unfractionated heparin with enoxaparin duplicates antithrombin-dependent anticoagulation and raises the risk of hemorrhage. It is generally unnecessary and unsafe at therapeutic doses.
What this interaction means in plain words
Enoxaparin and Heparin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Enoxaparin belongs to Cardiovascular; Heparin belongs to Cardiovascular.
Why it happens
Additive anti-Xa and anti-IIa activity via antithrombin potentiation.
What to do
Avoid overlapping therapeutic doses and use a single heparin product; when switching, start the new agent when the next dose of the old one is due. Monitor for bleeding and platelet counts.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
- Inhixa 10,000 IU (100 mg) in 1.0 mL solution for injection in pre-filled syringe - SmPC sections 4.3/4.5 (names the partner; "sections 4.4 and 4.8). ## SmPC 4.3 Contraindications Enoxaparin sodium is contraindicated in patients with: • Hypersensitivity to enoxaparin sodium, heparin or ") — electronic medicines compendium (UK SmPC)
Other interactions of Heparin
- Defibrotide + Heparin Contraindicated
- Heparin + Ketorolac Contraindicated
- Heparin + Oritavancin Contraindicated
- Acemetacin + Heparin Major
- Acetylsalicylic acid + Heparin Major
- Alteplase + Heparin Major
Other interactions of Enoxaparin
- Defibrotide + Enoxaparin Contraindicated
- Enoxaparin + Ketorolac Contraindicated
- Enoxaparin + Mifepristone Contraindicated
- Abciximab + Enoxaparin Major
- Aceclofenac + Enoxaparin Major
- Acetylsalicylic acid + Enoxaparin Major
Frequently asked questions
Can I take Enoxaparin with Heparin?
MediHelp rates the interaction as major. Enoxaparin and Heparin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Using unfractionated heparin with enoxaparin duplicates antithrombin-dependent anticoagulation and raises the risk of hemorrhage. It is generally unnecessary and unsafe at therapeutic doses.
How serious is the interaction between Enoxaparin and Heparin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid overlapping therapeutic doses and use a single heparin product; when switching, start the new agent when the next dose of the old one is due. Monitor for bleeding and platelet counts.
What other medicines interact with Heparin?
MediHelp also lists interactions of Heparin with, for example, Defibrotide, Ketorolac, Oritavancin. The full list is on the Heparin page.
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