Drug interactions
Fenfluramine + Isoflurane
Severity: Moderate
Fenfluramine and Isoflurane: 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
Fenfluramine is a serotonergic agent with sympathomimetic-like cardiovascular effects, and halogenated anesthetics sensitize the myocardium to catecholamines. Perioperative hemodynamic instability and arrhythmias are theoretically possible. Fenfluramine can also affect blood pressure and heart valves with chronic use.
What this interaction means in plain words
Fenfluramine and Isoflurane 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.
Fenfluramine belongs to Central Nervous System; Isoflurane belongs to Central Nervous System.
Why it happens
The mechanism is not well established; likely additive cardiovascular and autonomic effects, including myocardial sensitization by the volatile anesthetic.
What to do
Inform the anesthesia team of fenfluramine use and monitor ECG and blood pressure continuously. Be prepared to treat hypertension or arrhythmias and use vasopressors cautiously.
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 Fenfluramine
- Fenfluramine + Isocarboxazid Contraindicated
- Fenfluramine + Linezolid Contraindicated
- Fenfluramine + Phenelzine Contraindicated
- Fenfluramine + Selegiline Contraindicated
- Fenfluramine + Tranylcypromine Contraindicated
- Almotriptan + Fenfluramine Major
Frequently asked questions
Can I take Fenfluramine with Isoflurane?
MediHelp rates the interaction as moderate. Fenfluramine and Isoflurane 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. Fenfluramine is a serotonergic agent with sympathomimetic-like cardiovascular effects, and halogenated anesthetics sensitize the myocardium to catecholamines. Perioperative hemodynamic instability and arrhythmias are theoretically possible. Fenfluramine can also affect blood pressure and heart valves with chronic use.
How serious is the interaction between Fenfluramine and Isoflurane?
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 of fenfluramine use and monitor ECG and blood pressure continuously. Be prepared to treat hypertension or arrhythmias and use vasopressors cautiously.
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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