Drug interactions
Fenfluramine + Imipramine
Severity: Major
Fenfluramine and Imipramine: 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 drugs enhance serotonergic activity, so combined use may cause serotonin syndrome. Fenfluramine also carries cardiac valvular and pulmonary hypertension warnings, and imipramine may alter its sympathomimetic effects.
What this interaction means in plain words
Fenfluramine and Imipramine 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.
Fenfluramine belongs to Central Nervous System; Imipramine belongs to Central Nervous System.
Why it happens
Additive serotonergic effects, as fenfluramine releases serotonin and imipramine blocks its reuptake.
What to do
Monitor for agitation, tremor, hyperthermia, clonus and autonomic instability, and avoid the combination if alternatives exist. Use the lowest effective doses and stop one drug if serotonin toxicity appears.
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 Imipramine
- Dronedarone + Imipramine Contraindicated
- Imipramine + Isocarboxazid Contraindicated
- Imipramine + Phenelzine Contraindicated
- Imipramine + Pimozide Contraindicated
- Imipramine + Rasagiline Contraindicated
- Imipramine + Safinamide Contraindicated
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 Imipramine?
MediHelp rates the interaction as major. Fenfluramine and Imipramine 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 drugs enhance serotonergic activity, so combined use may cause serotonin syndrome. Fenfluramine also carries cardiac valvular and pulmonary hypertension warnings, and imipramine may alter its sympathomimetic effects.
How serious is the interaction between Fenfluramine and Imipramine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for agitation, tremor, hyperthermia, clonus and autonomic instability, and avoid the combination if alternatives exist. Use the lowest effective doses and stop one drug if serotonin toxicity appears.
What other medicines interact with Imipramine?
MediHelp also lists interactions of Imipramine with, for example, Dronedarone, Isocarboxazid, Phenelzine. The full list is on the Imipramine page.
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