Drug interactions
Isoflurane + Lofexidine
Severity: Moderate
Isoflurane and Lofexidine: moderate 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
Lofexidine can prolong the QT interval and cause bradycardia and hypotension. Isoflurane adds QT prolongation and hypotension, so combined use increases perioperative cardiovascular risk.
What this interaction means in plain words
Isoflurane and Lofexidine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Isoflurane belongs to Central Nervous System; Lofexidine belongs to Central Nervous System.
Why it happens
Additive QT prolongation and additive hypotensive and bradycardic effects.
What to do
Monitor the ECG, heart rate and blood pressure during anesthesia and correct electrolytes beforehand. Check baseline QTc in patients on lofexidine.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Isoflurane
Other interactions of Lofexidine
- Adagrasib + Lofexidine Major
- Alfuzosin + Lofexidine Major
- Amiodarone + Lofexidine Major
- Amisulpride + Lofexidine Major
- Anagrelide + Lofexidine Major
- Apomorphine + Lofexidine Major
Frequently asked questions
Can I take Isoflurane with Lofexidine?
MediHelp rates the interaction as moderate. Isoflurane and Lofexidine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Lofexidine can prolong the QT interval and cause bradycardia and hypotension. Isoflurane adds QT prolongation and hypotension, so combined use increases perioperative cardiovascular risk.
How serious is the interaction between Isoflurane and Lofexidine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor the ECG, heart rate and blood pressure during anesthesia and correct electrolytes beforehand. Check baseline QTc in patients on lofexidine.
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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