Drug interactions
Fenfluramine + Orphenadrin
Severity: Minor
Fenfluramine and Orphenadrin: minor 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
The legacy note describes opposing effects on sedation, but the clinical outcome of combining them is unclear. Fenfluramine can itself cause somnolence and has serotonergic activity, while orphenadrine adds anticholinergic and sedative effects.
What this interaction means in plain words
Fenfluramine and Orphenadrin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Fenfluramine belongs to Central Nervous System; Orphenadrin belongs to Musculoskeletal.
Why it happens
No well-established mechanism; possible opposing or additive central effects.
What to do
No specific adjustment is needed; monitor for excess drowsiness or anticholinergic effects when starting the combination.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Orphenadrin
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 Orphenadrin?
MediHelp rates the interaction as minor. Fenfluramine and Orphenadrin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. The legacy note describes opposing effects on sedation, but the clinical outcome of combining them is unclear. Fenfluramine can itself cause somnolence and has serotonergic activity, while orphenadrine adds anticholinergic and sedative effects.
How serious is the interaction between Fenfluramine and Orphenadrin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No specific adjustment is needed; monitor for excess drowsiness or anticholinergic effects when starting the combination.
What other medicines interact with Orphenadrin?
MediHelp also lists interactions of Orphenadrin with, for example, Alfentanil, Amobarbital, Benzhydrocodone / acetaminophen. The full list is on the Orphenadrin page.
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