Drug interactions
Fluphenazine + Pentazocine
Severity: Moderate
Fluphenazine 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
Both drugs depress the central nervous system, so taking them together can cause more drowsiness, slowed psychomotor performance and, at higher doses, respiratory depression. Older or frail patients are particularly vulnerable.
What this interaction means in plain words
Fluphenazine 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.
Fluphenazine belongs to Central Nervous System; Pentazocine belongs to Musculoskeletal.
Why it happens
Additive CNS depression from opioid agonist-antagonist activity plus dopamine and histamine receptor blockade by the phenothiazine.
What to do
Start with the lowest effective doses and monitor for sedation and respiratory depression, especially during initiation or dose increases. Counsel patients to avoid driving and alcohol.
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 Fluphenazine
- Arsenic trioxide + Fluphenazine Contraindicated
- Dofetilide + Fluphenazine Contraindicated
- Fluphenazine + Ibutilide Contraindicated
- Fluphenazine + Pimozide Contraindicated
- Adagrasib + Fluphenazine Major
- Alfentanil + Fluphenazine Major
Frequently asked questions
Can I take Fluphenazine with Pentazocine?
MediHelp rates the interaction as moderate. Fluphenazine 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. Both drugs depress the central nervous system, so taking them together can cause more drowsiness, slowed psychomotor performance and, at higher doses, respiratory depression. Older or frail patients are particularly vulnerable.
How serious is the interaction between Fluphenazine 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 monitor for sedation and respiratory depression, especially during initiation or dose increases. Counsel patients to avoid driving and alcohol.
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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