Drug interactions
Fenfluramine + Pentazocine
Severity: Moderate
Fenfluramine and Pentazocine: 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 releases serotonin and pentazocine has some serotonergic activity, so combined use may raise the risk of serotonin syndrome. Both drugs can also affect alertness, and fenfluramine commonly causes somnolence, adding to opioid sedation.
What this interaction means in plain words
Fenfluramine and Pentazocine 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; Pentazocine belongs to Musculoskeletal.
Why it happens
Possible additive serotonergic effects and additive CNS depression.
What to do
Monitor for serotonin toxicity (agitation, tremor, hyperreflexia, hyperthermia, diarrhea) and for excessive sedation. Use the lowest effective doses and reassess if symptoms appear.
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 Pentazocine
- Calcium / magnesium / potassium / sodium oxybates + Pentazocine Contraindicated
- Olanzapine / samidorphan + Pentazocine Contraindicated
- Pentazocine + Phenelzine Contraindicated
- Pentazocine + Tranylcypromine Contraindicated
- Alfentanil + Pentazocine Major
- Alprazolam + Pentazocine Major
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 Pentazocine?
MediHelp rates the interaction as moderate. Fenfluramine and Pentazocine 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 releases serotonin and pentazocine has some serotonergic activity, so combined use may raise the risk of serotonin syndrome. Both drugs can also affect alertness, and fenfluramine commonly causes somnolence, adding to opioid sedation.
How serious is the interaction between Fenfluramine and Pentazocine?
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, hyperreflexia, hyperthermia, diarrhea) and for excessive sedation. Use the lowest effective doses and reassess if symptoms appear.
What other medicines interact with Pentazocine?
MediHelp also lists interactions of Pentazocine with, for example, Calcium / magnesium / potassium / sodium oxybates, Olanzapine / samidorphan, Phenelzine. The full list is on the Pentazocine page.
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