Drug interactions
Fenfluramine + Tapentadol
Severity: Moderate
Fenfluramine 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
Fenfluramine is a serotonin-releasing agent used for seizures in Dravet and Lennox-Gastaut syndromes. Combined with tapentadol, which has serotonergic and noradrenergic activity, there is a theoretical risk of serotonin syndrome, and fenfluramine can itself cause somnolence.
What this interaction means in plain words
Fenfluramine 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.
Fenfluramine belongs to Central Nervous System; Tapentadol belongs to Musculoskeletal.
Why it happens
Additive serotonergic activity and possible additive CNS depression; the net effect is not well characterized.
What to do
Monitor for serotonin toxicity (agitation, tremor, clonus, hyperthermia) and for sedation. Use the lowest effective tapentadol dose.
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 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
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 Tapentadol?
MediHelp rates the interaction as moderate. Fenfluramine 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. Fenfluramine is a serotonin-releasing agent used for seizures in Dravet and Lennox-Gastaut syndromes. Combined with tapentadol, which has serotonergic and noradrenergic activity, there is a theoretical risk of serotonin syndrome, and fenfluramine can itself cause somnolence.
How serious is the interaction between Fenfluramine 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: Monitor for serotonin toxicity (agitation, tremor, clonus, hyperthermia) and for sedation. Use the lowest effective tapentadol dose.
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.
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