Drug interactions
Fluphenazine + Quazepam
Severity: Moderate
Fluphenazine and Quazepam: 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
Quazepam is a long-acting benzodiazepine hypnotic, and fluphenazine also causes sedation. Combined use can lead to excessive drowsiness, impaired coordination, falls and respiratory depression, especially in older people.
What this interaction means in plain words
Fluphenazine and Quazepam 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 CNS depression via GABA-A enhancement and antipsychotic receptor blockade.
What to do
Use the lowest effective quazepam dose and monitor sedation, psychomotor function and respiration. Counsel patients to avoid 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 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 Quazepam?
MediHelp rates the interaction as moderate. Fluphenazine and Quazepam 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. Quazepam is a long-acting benzodiazepine hypnotic, and fluphenazine also causes sedation. Combined use can lead to excessive drowsiness, impaired coordination, falls and respiratory depression, especially in older people.
How serious is the interaction between Fluphenazine and Quazepam?
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 quazepam dose and monitor sedation, psychomotor function and respiration. Counsel patients to avoid alcohol and driving.
What other medicines interact with Fluphenazine?
MediHelp also lists interactions of Fluphenazine with, for example, Arsenic trioxide, Dofetilide, Ibutilide. The full list is on the Fluphenazine page.
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