Drug interactions
Fluoxetine + Pentazocine
Severity: Moderate
Fluoxetine 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
Combining an SSRI with pentazocine may raise the risk of serotonin syndrome, though reports specific to pentazocine are limited. Fluoxetine has a long half-life, so the risk persists after it is stopped.
What this interaction means in plain words
Fluoxetine 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.
Fluoxetine belongs to Central Nervous System; Pentazocine belongs to Musculoskeletal.
Why it happens
Possible additive serotonergic effect; pentazocine's serotonergic activity is poorly characterized.
What to do
Monitor for signs of serotonin toxicity, especially at initiation and dose increases. Discontinue one or both agents if symptoms occur.
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 Fluoxetine
- Fluoxetine + Isocarboxazid Contraindicated
- Fluoxetine + Mavacamten Contraindicated
- Fluoxetine + Methylene blue Contraindicated
- Fluoxetine + Phenelzine Contraindicated
- Fluoxetine + Pimozide Contraindicated
- Fluoxetine + Rasagiline Contraindicated
Frequently asked questions
Can I take Fluoxetine with Pentazocine?
MediHelp rates the interaction as moderate. Fluoxetine 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. Combining an SSRI with pentazocine may raise the risk of serotonin syndrome, though reports specific to pentazocine are limited. Fluoxetine has a long half-life, so the risk persists after it is stopped.
How serious is the interaction between Fluoxetine 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 signs of serotonin toxicity, especially at initiation and dose increases. Discontinue one or both agents if symptoms occur.
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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