Drug interactions
Nortriptyline + Pentazocine
Severity: Moderate
Nortriptyline 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 pentazocine with nortriptyline can increase drowsiness and psychomotor impairment. Pentazocine has weak serotonergic activity, and together with a tricyclic antidepressant there is a possible, though uncommon, risk of serotonin toxicity. Seizure threshold may also be lowered.
What this interaction means in plain words
Nortriptyline 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.
Nortriptyline belongs to Central Nervous System; Pentazocine belongs to Musculoskeletal.
Why it happens
Additive CNS depressant effects, with possible additive serotonergic activity and anticholinergic effects from the tricyclic.
What to do
Start with the lowest effective doses and warn the patient about sedation and impaired driving. Monitor for agitation, tremor, hyperthermia or clonus, and stop one agent if serotonin toxicity 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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Nortriptyline and Pentazocine, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
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 Nortriptyline
- Disopyramide + Nortriptyline Contraindicated
- Dofetilide + Nortriptyline Contraindicated
- Dronedarone + Nortriptyline Contraindicated
- Ibutilide + Nortriptyline Contraindicated
- Isocarboxazid + Nortriptyline Contraindicated
- Methylene blue + Nortriptyline Contraindicated
Frequently asked questions
Can I take Nortriptyline with Pentazocine?
MediHelp rates the interaction as moderate. Nortriptyline 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 pentazocine with nortriptyline can increase drowsiness and psychomotor impairment. Pentazocine has weak serotonergic activity, and together with a tricyclic antidepressant there is a possible, though uncommon, risk of serotonin toxicity. Seizure threshold may also be lowered.
How serious is the interaction between Nortriptyline 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: Start with the lowest effective doses and warn the patient about sedation and impaired driving. Monitor for agitation, tremor, hyperthermia or clonus, and stop one agent if serotonin toxicity 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.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
