Drug interactions
Ceftriaxone + Erythromycin
Severity: Minor
Ceftriaxone and Erythromycin: 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
Macrolide bacteriostatic activity could theoretically blunt the bactericidal effect of a beta-lactam that depends on actively dividing bacteria. In practice ceftriaxone with a macrolide is a standard regimen for community-acquired pneumonia, and clinical antagonism has not been convincingly shown.
What this interaction means in plain words
Ceftriaxone and Erythromycin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Ceftriaxone belongs to Anti Bacterial; Erythromycin belongs to Anti Bacterial.
Why it happens
Theoretical pharmacodynamic antagonism between a protein synthesis inhibitor and a cell-wall-active bactericidal agent.
What to do
No dose change is needed; monitor clinical response and reassess the need for both agents once pathogens are identified.
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 Erythromycin
- Conivaptan + Erythromycin Contraindicated
- Dihydroergotamine intranasal + Erythromycin Contraindicated
- Dihydroergotamine + Erythromycin Contraindicated
- Domperidone + Erythromycin Contraindicated
- Dronedarone + Erythromycin Contraindicated
- Droperidol + Erythromycin Contraindicated
Other interactions of Ceftriaxone
- Calcium chloride + Ceftriaxone Contraindicated
- Calcium gluconate + Ceftriaxone Contraindicated
- Calcium + Ceftriaxone Contraindicated
- Ceftriaxone + Lactated ringer's Contraindicated
- Ceftriaxone + Ringer's solution Contraindicated
- Calcium acetate + Ceftriaxone Major
Frequently asked questions
Can I take Ceftriaxone with Erythromycin?
MediHelp rates the interaction as minor. Ceftriaxone and Erythromycin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Macrolide bacteriostatic activity could theoretically blunt the bactericidal effect of a beta-lactam that depends on actively dividing bacteria. In practice ceftriaxone with a macrolide is a standard regimen for community-acquired pneumonia, and clinical antagonism has not been convincingly shown.
How serious is the interaction between Ceftriaxone and Erythromycin?
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; monitor clinical response and reassess the need for both agents once pathogens are identified.
What other medicines interact with Erythromycin?
MediHelp also lists interactions of Erythromycin with, for example, Conivaptan, Dihydroergotamine intranasal, Dihydroergotamine. The full list is on the Erythromycin page.
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