Drug interactions
Erythromycin lactobionate + Isoflurane
Severity: Major
Erythromycin lactobionate and Isoflurane: major 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
Both agents can prolong the QT interval, and intravenous erythromycin carries a particular proarrhythmic risk. Use during anesthesia may raise the likelihood of torsades de pointes, especially with electrolyte disturbances.
What this interaction means in plain words
Erythromycin lactobionate and Isoflurane can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Erythromycin lactobionate belongs to Anti Bacterial; Isoflurane belongs to Central Nervous System.
Why it happens
Additive prolongation of cardiac repolarization through effects on cardiac potassium channels.
What to do
Obtain a baseline ECG and correct potassium and magnesium before anesthesia. Consider a non-QT-prolonging antibiotic or monitor the QTc continuously during the procedure.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Isoflurane
Other interactions of Erythromycin lactobionate
- Cisapride + Erythromycin lactobionate Contraindicated
- Dihydroergotamine + Erythromycin lactobionate Contraindicated
- Dronedarone + Erythromycin lactobionate Contraindicated
- Eletriptan + Erythromycin lactobionate Contraindicated
- Ergotamine + Erythromycin lactobionate Contraindicated
- Erythromycin lactobionate + Flibanserin Contraindicated
Frequently asked questions
Can I take Erythromycin lactobionate with Isoflurane?
MediHelp rates the interaction as major. Erythromycin lactobionate and Isoflurane can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Both agents can prolong the QT interval, and intravenous erythromycin carries a particular proarrhythmic risk. Use during anesthesia may raise the likelihood of torsades de pointes, especially with electrolyte disturbances.
How serious is the interaction between Erythromycin lactobionate and Isoflurane?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Obtain a baseline ECG and correct potassium and magnesium before anesthesia. Consider a non-QT-prolonging antibiotic or monitor the QTc continuously during the procedure.
What other medicines interact with Isoflurane?
MediHelp also lists interactions of Isoflurane with, for example, Adrenaline-articaine, Amisulpride, Arsenic trioxide. The full list is on the Isoflurane page.
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