Drug interactions
Fluoxetine + Pentoxifylline
Severity: Moderate
Fluoxetine and Pentoxifylline: 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
Pentoxifylline has antiplatelet and hemorheologic effects and fluoxetine impairs platelet serotonin uptake. Together they may increase the risk of bleeding. Fluoxetine may also inhibit CYP1A2 to a small extent, which could modestly raise pentoxifylline levels.
What this interaction means in plain words
Fluoxetine and Pentoxifylline 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; Pentoxifylline belongs to Cardiovascular.
Why it happens
Additive effects on platelet function from pentoxifylline and SSRI-mediated serotonin depletion in platelets.
What to do
Monitor for bruising, gastrointestinal or other bleeding, especially with other antithrombotics or NSAIDs. Consider gastroprotection in high-risk patients.
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 Pentoxifylline
- Amifostine + Pentoxifylline Moderate
- Fluvoxamine + Pentoxifylline Moderate
- Insulin degludec / insulin aspart + Pentoxifylline Moderate
- Methoxsalen + Pentoxifylline Moderate
- Mexiletine + Pentoxifylline Moderate
- Nifedipine + Pentoxifylline Moderate
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 Pentoxifylline?
MediHelp rates the interaction as moderate. Fluoxetine and Pentoxifylline 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. Pentoxifylline has antiplatelet and hemorheologic effects and fluoxetine impairs platelet serotonin uptake. Together they may increase the risk of bleeding. Fluoxetine may also inhibit CYP1A2 to a small extent, which could modestly raise pentoxifylline levels.
How serious is the interaction between Fluoxetine and Pentoxifylline?
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 bruising, gastrointestinal or other bleeding, especially with other antithrombotics or NSAIDs. Consider gastroprotection in high-risk patients.
What other medicines interact with Pentoxifylline?
MediHelp also lists interactions of Pentoxifylline with, for example, Amifostine, Fluvoxamine, Insulin degludec / insulin aspart. The full list is on the Pentoxifylline page.
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