Drug interactions
Erythromycin ethylsuccinate + Isoflurane
Severity: Major
Erythromycin ethylsuccinate 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. Combined use perioperatively may raise the risk of torsades de pointes, especially with electrolyte disturbances or other QT-prolonging drugs.
What this interaction means in plain words
Erythromycin ethylsuccinate 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.
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 closely during and after 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
Frequently asked questions
Can I take Erythromycin ethylsuccinate with Isoflurane?
MediHelp rates the interaction as major. Erythromycin ethylsuccinate 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. Combined use perioperatively may raise the risk of torsades de pointes, especially with electrolyte disturbances or other QT-prolonging drugs.
How serious is the interaction between Erythromycin ethylsuccinate 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 closely during and after 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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