Drug interactions
Haloperidol + Pentazocine
Severity: Moderate
Haloperidol 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
Combined use can increase sedation, dizziness and impaired alertness, and may add to respiratory depression. Hypotension and psychomotor impairment can also be more pronounced.
What this interaction means in plain words
Haloperidol 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.
Haloperidol belongs to Central Nervous System; Pentazocine belongs to Musculoskeletal.
Why it happens
Additive CNS depression from opioid receptor activity and dopamine antagonism by the antipsychotic.
What to do
Use the lowest effective doses and monitor sedation level and respiratory status, especially at initiation and after dose changes. Advise against alcohol and driving.
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 Haloperidol
- Dofetilide + Haloperidol Contraindicated
- Dronedarone + Haloperidol Contraindicated
- Haloperidol + Ibutilide Contraindicated
- Haloperidol + Levoketoconazole Contraindicated
- Haloperidol + Panobinostat Contraindicated
- Haloperidol + Pimozide Contraindicated
Frequently asked questions
Can I take Haloperidol with Pentazocine?
MediHelp rates the interaction as moderate. Haloperidol 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. Combined use can increase sedation, dizziness and impaired alertness, and may add to respiratory depression. Hypotension and psychomotor impairment can also be more pronounced.
How serious is the interaction between Haloperidol 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 sedation level and respiratory status, especially at initiation and after dose changes. Advise against alcohol and driving.
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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