Drug interactions
Desvenlafaxine + Pentazocine
Severity: Moderate
Desvenlafaxine 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
Opioids combined with serotonergic antidepressants such as desvenlafaxine carry a labeled risk of serotonin syndrome. Pentazocine has limited serotonergic activity, so the risk is probably low, but additive CNS effects can occur.
What this interaction means in plain words
Desvenlafaxine 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.
Desvenlafaxine belongs to Central Nervous System; Pentazocine belongs to Musculoskeletal.
Why it happens
Desvenlafaxine inhibits serotonin and norepinephrine reuptake, and opioid agents may add serotonergic effects; pentazocine's contribution is uncertain.
What to do
Monitor for agitation, tremor, clonus, hyperthermia and diarrhea, especially after dose increases. Use the lowest effective doses and stop both agents if serotonin syndrome is suspected.
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 Desvenlafaxine
- Desvenlafaxine + Isocarboxazid Contraindicated
- Desvenlafaxine + Methylene blue Contraindicated
- Desvenlafaxine + Phenelzine Contraindicated
- Desvenlafaxine + Rasagiline Contraindicated
- Desvenlafaxine + Safinamide Contraindicated
- Desvenlafaxine + Selegiline Contraindicated
Frequently asked questions
Can I take Desvenlafaxine with Pentazocine?
MediHelp rates the interaction as moderate. Desvenlafaxine 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. Opioids combined with serotonergic antidepressants such as desvenlafaxine carry a labeled risk of serotonin syndrome. Pentazocine has limited serotonergic activity, so the risk is probably low, but additive CNS effects can occur.
How serious is the interaction between Desvenlafaxine 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 agitation, tremor, clonus, hyperthermia and diarrhea, especially after dose increases. Use the lowest effective doses and stop both agents if serotonin syndrome is suspected.
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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