Drug interactions
Isoflurane + Nortriptyline
Severity: Moderate
Isoflurane and Nortriptyline: 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
Isoflurane can prolong the QT interval and cause hypotension, and nortriptyline adds arrhythmic potential and may increase sensitivity to catecholamines. Arrhythmias or hemodynamic instability may occur during anesthesia.
What this interaction means in plain words
Isoflurane and Nortriptyline 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; Nortriptyline belongs to Central Nervous System.
Why it happens
Additive QT prolongation and cardiovascular depression.
What to do
Inform the anesthesia team and monitor the ECG and blood pressure continuously. Avoid other QT-prolonging drugs perioperatively where possible.
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 Nortriptyline
- Disopyramide + Nortriptyline Contraindicated
- Dofetilide + Nortriptyline Contraindicated
- Dronedarone + Nortriptyline Contraindicated
- Ibutilide + Nortriptyline Contraindicated
- Isocarboxazid + Nortriptyline Contraindicated
- Methylene blue + Nortriptyline Contraindicated
Other interactions of Isoflurane
Frequently asked questions
Can I take Isoflurane with Nortriptyline?
MediHelp rates the interaction as moderate. Isoflurane and Nortriptyline 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 can prolong the QT interval and cause hypotension, and nortriptyline adds arrhythmic potential and may increase sensitivity to catecholamines. Arrhythmias or hemodynamic instability may occur during anesthesia.
How serious is the interaction between Isoflurane and Nortriptyline?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Inform the anesthesia team and monitor the ECG and blood pressure continuously. Avoid other QT-prolonging drugs perioperatively where possible.
What other medicines interact with Nortriptyline?
MediHelp also lists interactions of Nortriptyline with, for example, Disopyramide, Dofetilide, Dronedarone. The full list is on the Nortriptyline page.
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