Drug interactions
Cefazolin + Heparin
Severity: Minor
Cefazolin and Heparin: minor 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
Cefazolin is not known to alter the anticoagulant effect of heparin in a clinically relevant way. The two are commonly co-administered perioperatively without special measures. Any additive bleeding risk is theoretical.
What this interaction means in plain words
Cefazolin and Heparin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Cefazolin belongs to Anti Bacterial; Heparin belongs to Cardiovascular.
Why it happens
No established pharmacodynamic mechanism; cefazolin has negligible effect on clotting factor synthesis or platelet function at usual doses.
What to do
Continue usual heparin monitoring with aPTT or anti-Xa as appropriate; no cefazolin-specific adjustment is required.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Cefazolin
- Amikacin + Cefazolin Moderate
- Bcg vaccine live + Cefazolin Moderate
- Cefazolin + Cholera vaccine Moderate
- Cefazolin + Dexamethasone-tobramycin Moderate
- Cefazolin + Gentamicin Moderate
- Cefazolin + Kanamycin Moderate
Other interactions of Heparin
- Defibrotide + Heparin Contraindicated
- Heparin + Ketorolac Contraindicated
- Heparin + Oritavancin Contraindicated
- Acemetacin + Heparin Major
- Acetylsalicylic acid + Heparin Major
- Alteplase + Heparin Major
Frequently asked questions
Can I take Cefazolin with Heparin?
MediHelp rates the interaction as minor. Cefazolin and Heparin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Cefazolin is not known to alter the anticoagulant effect of heparin in a clinically relevant way. The two are commonly co-administered perioperatively without special measures. Any additive bleeding risk is theoretical.
How serious is the interaction between Cefazolin and Heparin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Continue usual heparin monitoring with aPTT or anti-Xa as appropriate; no cefazolin-specific adjustment is required.
What other medicines interact with Cefazolin?
MediHelp also lists interactions of Cefazolin with, for example, Amikacin, Bcg vaccine live, Cholera vaccine. The full list is on the Cefazolin page.
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