Drug interactions
Isoflurane + Pentamidine
Severity: Major
Isoflurane and Pentamidine: 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
Systemic pentamidine can prolong the QT interval and cause torsades de pointes, and isoflurane may contribute further QT lengthening. Pentamidine can also cause hypotension and dysglycemia, which complicate anesthesia.
What this interaction means in plain words
Isoflurane and Pentamidine 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.
Isoflurane belongs to Central Nervous System; Pentamidine belongs to Anti Parasitic.
Why it happens
Additive prolongation of ventricular repolarization (QTc).
What to do
Check a baseline ECG, potassium, magnesium and glucose before anesthesia. Monitor the ECG continuously and delay elective surgery if the QTc is markedly prolonged.
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 Pentamidine
- Clomipramine + Pentamidine Contraindicated
- Desipramine + Pentamidine Contraindicated
- Dronedarone + Pentamidine Contraindicated
- Moxifloxacin + Pentamidine Contraindicated
- Nortriptyline + Pentamidine Contraindicated
- Pentamidine + Pimozide Contraindicated
Frequently asked questions
Can I take Isoflurane with Pentamidine?
MediHelp rates the interaction as major. Isoflurane and Pentamidine 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. Systemic pentamidine can prolong the QT interval and cause torsades de pointes, and isoflurane may contribute further QT lengthening. Pentamidine can also cause hypotension and dysglycemia, which complicate anesthesia.
How serious is the interaction between Isoflurane and Pentamidine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check a baseline ECG, potassium, magnesium and glucose before anesthesia. Monitor the ECG continuously and delay elective surgery if the QTc is markedly prolonged.
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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