Drug interactions
calcium + ceftriaxone
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.
Overview
Ceftriaxone forms insoluble precipitates with IV calcium, causing emboli/renal deposition. Contraindicated with IV calcium in neonates; in older patients avoid simultaneous or same-line administration.
Mechanism of action
Physicochemical precipitation of ceftriaxone–calcium complexes in blood and tissues; risk greatest with IV coadministration, especially in neonates.
Clinical management
Neonates ≤28 days: do not use ceftriaxone with IV calcium (incl. TPN). >28 days: avoid simultaneous/Y-site; administer sequentially via separate lines with thorough flushing. Do not reconstitute/dilute ceftriaxone with calcium-containing solutions (e.g., Ringer’s/Hartmann’s).
Drug reference
References
- Rocephin (ceftriaxone) Injection Prescribing Information — FDA Label
- Ceftriaxone: Drug Interactions (calcium-containing solutions) — Lexicomp
- Ceftriaxone 1 g powder for solution for injection/infusion – Summary of Product Characteristics — EMA
Frequently asked questions
Can I take calcium with ceftriaxone?
The interaction is rated: Contraindicated. Ceftriaxone forms insoluble precipitates with IV calcium, causing emboli/renal deposition. Contraindicated with IV calcium in neonates; in older patients avoid simultaneous or same-line administration.
How serious is the interaction between calcium and ceftriaxone?
The interaction is rated: Contraindicated. Evidence level: High.
How is the interaction between calcium and ceftriaxone managed?
Neonates ≤28 days: do not use ceftriaxone with IV calcium (incl. TPN). >28 days: avoid simultaneous/Y-site; administer sequentially via separate lines with thorough flushing. Do not reconstitute/dilute ceftriaxone with calcium-containing solutions (e.g., Ringer’s/Hartmann’s).
Why do calcium and ceftriaxone interact?
Physicochemical precipitation of ceftriaxone–calcium complexes in blood and tissues; risk greatest with IV coadministration, especially in neonates.
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