Drug interactions
Orphenadrine + Pentazocine
Severity: Moderate
Orphenadrine 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
Orphenadrine has sedative and anticholinergic properties and can add to opioid-induced drowsiness, confusion and psychomotor impairment. Elderly patients are at greater risk of confusion, falls and anticholinergic effects such as urinary retention and constipation.
What this interaction means in plain words
Orphenadrine 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.
Why it happens
Additive central nervous system depression and anticholinergic effects.
What to do
Use the lowest effective doses and monitor for excess sedation, confusion and anticholinergic effects. Advise against driving and alcohol use.
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
Frequently asked questions
Can I take Orphenadrine with Pentazocine?
MediHelp rates the interaction as moderate. Orphenadrine 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. Orphenadrine has sedative and anticholinergic properties and can add to opioid-induced drowsiness, confusion and psychomotor impairment. Elderly patients are at greater risk of confusion, falls and anticholinergic effects such as urinary retention and constipation.
How serious is the interaction between Orphenadrine 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: Use the lowest effective doses and monitor for excess sedation, confusion and anticholinergic effects. Advise against driving and alcohol use.
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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