Drug interactions
Amitriptyline + Pentazocine
Severity: Moderate
Amitriptyline 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
Amitriptyline adds sedation and anticholinergic effects to pentazocine's CNS depression, increasing the risk of drowsiness and respiratory depression. Serotonin syndrome is also a theoretical concern given amitriptyline's serotonin reuptake inhibition.
What this interaction means in plain words
Amitriptyline 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.
Amitriptyline belongs to Central Nervous System; Pentazocine belongs to Musculoskeletal.
Why it happens
Additive CNS depression, with a possible serotonergic contribution from tricyclic reuptake inhibition.
What to do
Use reduced starting doses and monitor sedation, respiration and signs of serotonin toxicity. Avoid in older adults or those with respiratory disease where possible.
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 Amitriptyline
- Amitriptyline + Isocarboxazid Contraindicated
- Amitriptyline + Methylene blue Contraindicated
- Amitriptyline + Phenelzine Contraindicated
- Amitriptyline + Pimozide Contraindicated
- Amitriptyline + Procarbazine Contraindicated
- Amitriptyline + Safinamide Contraindicated
Frequently asked questions
Can I take Amitriptyline with Pentazocine?
MediHelp rates the interaction as moderate. Amitriptyline 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. Amitriptyline adds sedation and anticholinergic effects to pentazocine's CNS depression, increasing the risk of drowsiness and respiratory depression. Serotonin syndrome is also a theoretical concern given amitriptyline's serotonin reuptake inhibition.
How serious is the interaction between Amitriptyline 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 reduced starting doses and monitor sedation, respiration and signs of serotonin toxicity. Avoid in older adults or those with respiratory disease where possible.
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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