Drug interactions
Erythromycin + Penicillin vk
Severity: Minor
Erythromycin and Penicillin vk: 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
A bacteriostatic macrolide may theoretically reduce the bactericidal effect of penicillin V on growing organisms. Clinically important loss of efficacy has not been firmly demonstrated.
What this interaction means in plain words
Erythromycin and Penicillin vk have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Theoretical pharmacodynamic antagonism between a bacteriostatic protein synthesis inhibitor and a bactericidal cell wall inhibitor.
What to do
No routine change is needed; monitor clinical response and avoid unnecessary combination use for simple infections.
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
Frequently asked questions
Can I take Erythromycin with Penicillin vk?
MediHelp rates the interaction as minor. Erythromycin and Penicillin vk have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. A bacteriostatic macrolide may theoretically reduce the bactericidal effect of penicillin V on growing organisms. Clinically important loss of efficacy has not been firmly demonstrated.
How serious is the interaction between Erythromycin and Penicillin vk?
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 routine change is needed; monitor clinical response and avoid unnecessary combination use for simple infections.
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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