Drug interactions
Amitriptyline + Dexfenfluramine
Severity: Major
Amitriptyline and Dexfenfluramine: 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
Dexfenfluramine releases serotonin and blocks its reuptake, and amitriptyline also increases serotonergic and noradrenergic activity. The combination raises the risk of serotonin syndrome. Dexfenfluramine has been withdrawn from most markets.
What this interaction means in plain words
Amitriptyline and Dexfenfluramine 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.
Why it happens
Additive serotonergic effects from serotonin release and reuptake inhibition.
What to do
Avoid the combination. If serotonergic symptoms such as agitation, tremor or hyperthermia develop, stop both drugs and provide supportive care.
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 Amitriptyline
- Amitriptyline + Isocarboxazid Contraindicated
- Amitriptyline + Methylene blue Contraindicated
- Amitriptyline + Phenelzine Contraindicated
- Amitriptyline + Pimozide Contraindicated
- Amitriptyline + Procarbazine Contraindicated
- Amitriptyline + Safinamide Contraindicated
Frequently asked questions
Can I take Amitriptyline with Dexfenfluramine?
MediHelp rates the interaction as major. Amitriptyline and Dexfenfluramine 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. Dexfenfluramine releases serotonin and blocks its reuptake, and amitriptyline also increases serotonergic and noradrenergic activity. The combination raises the risk of serotonin syndrome. Dexfenfluramine has been withdrawn from most markets.
How serious is the interaction between Amitriptyline and Dexfenfluramine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination. If serotonergic symptoms such as agitation, tremor or hyperthermia develop, stop both drugs and provide supportive care.
What other medicines interact with Amitriptyline?
MediHelp also lists interactions of Amitriptyline with, for example, Isocarboxazid, Methylene blue, Phenelzine. The full list is on the Amitriptyline page.
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