Drug interactions
Cefazolin + Fondaparinux
Severity: Minor
Cefazolin and Fondaparinux: 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 has little direct effect on coagulation, so a meaningful additive anticoagulant effect with fondaparinux is not expected. Cefazolin is routinely given as surgical prophylaxis alongside fondaparinux thromboprophylaxis. The warning is largely theoretical.
What this interaction means in plain words
Cefazolin and Fondaparinux 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; Fondaparinux belongs to Cardiovascular.
Why it happens
Cefazolin lacks the N-methylthiotetrazole side chain and does not meaningfully impair vitamin K-dependent clotting, so any additive effect is theoretical.
What to do
No dose change is needed; follow routine bleeding surveillance for fondaparinux, including renal function.
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 Fondaparinux
- Defibrotide + Fondaparinux Contraindicated
- Fondaparinux + Ketorolac Contraindicated
- Abciximab + Fondaparinux Major
- Aceclofenac + Fondaparinux Major
- Acetylsalicylic acid + Fondaparinux Major
- Alteplase + Fondaparinux Major
Frequently asked questions
Can I take Cefazolin with Fondaparinux?
MediHelp rates the interaction as minor. Cefazolin and Fondaparinux 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 has little direct effect on coagulation, so a meaningful additive anticoagulant effect with fondaparinux is not expected. Cefazolin is routinely given as surgical prophylaxis alongside fondaparinux thromboprophylaxis. The warning is largely theoretical.
How serious is the interaction between Cefazolin and Fondaparinux?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No dose change is needed; follow routine bleeding surveillance for fondaparinux, including renal function.
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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