Drug interactions
Enoxaparin + Protamine
Severity: Moderate
Enoxaparin and Protamine: moderate interaction.
Last updated
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
Protamine is an antidote that binds heparins and neutralizes their anticoagulant activity, rather than adding to it. It partially reverses enoxaparin, neutralizing the anti-IIa effect fully but the anti-Xa effect only partly.
What this interaction means in plain words
Enoxaparin and Protamine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Protamine, a cationic protein, forms inactive complexes with the anionic enoxaparin, partially neutralizing its anticoagulant effect.
What to do
Use protamine intentionally for enoxaparin overdose or life-threatening bleeding, dosed according to the enoxaparin amount and time since last dose. Monitor for hypersensitivity and hypotension during infusion and for residual anti-Xa activity.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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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 Protamine?
MediHelp rates the interaction as moderate. Enoxaparin and Protamine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Protamine is an antidote that binds heparins and neutralizes their anticoagulant activity, rather than adding to it. It partially reverses enoxaparin, neutralizing the anti-IIa effect fully but the anti-Xa effect only partly.
How serious is the interaction between Enoxaparin and Protamine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use protamine intentionally for enoxaparin overdose or life-threatening bleeding, dosed according to the enoxaparin amount and time since last dose. Monitor for hypersensitivity and hypotension during infusion and for residual anti-Xa activity.
What other medicines interact with Enoxaparin?
MediHelp also lists interactions of Enoxaparin with, for example, Defibrotide, Ketorolac, Mifepristone. The full list is on the Enoxaparin page.
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