Drug interactions
Dexfenfluramine + Tapentadol
Severity: Moderate
Dexfenfluramine and Tapentadol: 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
Dexfenfluramine is a serotonin-releasing anorectic that has been withdrawn from most markets, and tapentadol also has serotonin-related activity through noradrenaline and serotonergic effects. A serotonergic interaction is theoretically possible, but there is no well-documented sedation interaction.
What this interaction means in plain words
Dexfenfluramine and Tapentadol 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.
Why it happens
Theoretical additive serotonergic and noradrenergic activity; the net effect on sedation is not established.
What to do
Avoid the combination where possible; if used together, monitor for signs of serotonin toxicity such as agitation, tremor, hyperreflexia and hyperthermia.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Dexfenfluramine and Tapentadol, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Tapentadol
- Calcium / magnesium / potassium / sodium oxybates + Tapentadol Contraindicated
- Isocarboxazid + Tapentadol Contraindicated
- Linezolid + Tapentadol Contraindicated
- Methylene blue + Tapentadol Contraindicated
- Olanzapine / samidorphan + Tapentadol Contraindicated
- Phenelzine + Tapentadol Contraindicated
Frequently asked questions
Can I take Dexfenfluramine with Tapentadol?
MediHelp rates the interaction as moderate. Dexfenfluramine and Tapentadol 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. Dexfenfluramine is a serotonin-releasing anorectic that has been withdrawn from most markets, and tapentadol also has serotonin-related activity through noradrenaline and serotonergic effects. A serotonergic interaction is theoretically possible, but there is no well-documented sedation interaction.
How serious is the interaction between Dexfenfluramine and Tapentadol?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination where possible; if used together, monitor for signs of serotonin toxicity such as agitation, tremor, hyperreflexia and hyperthermia.
What other medicines interact with Tapentadol?
MediHelp also lists interactions of Tapentadol with, for example, Calcium / magnesium / potassium / sodium oxybates, Isocarboxazid, Linezolid. The full list is on the Tapentadol page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
