Drug interactions
Dimenhydrinate + Fluphenazine
Severity: Moderate
Dimenhydrinate and Fluphenazine: 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
Dimenhydrinate, which releases diphenhydramine, causes sedation and anticholinergic effects. With fluphenazine these effects add up, which can cause drowsiness, impaired alertness and anticholinergic symptoms.
What this interaction means in plain words
Dimenhydrinate and Fluphenazine 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.
Dimenhydrinate belongs to Respiratory; Fluphenazine belongs to Central Nervous System.
Why it happens
Additive CNS depression and additive anticholinergic effects.
What to do
Advise the patient to avoid driving and alcohol, and monitor older patients for confusion and urinary retention. Use the lowest effective dimenhydrinate dose for the shortest time.
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
Other interactions of Dimenhydrinate
Frequently asked questions
Can I take Dimenhydrinate with Fluphenazine?
MediHelp rates the interaction as moderate. Dimenhydrinate and Fluphenazine 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. Dimenhydrinate, which releases diphenhydramine, causes sedation and anticholinergic effects. With fluphenazine these effects add up, which can cause drowsiness, impaired alertness and anticholinergic symptoms.
How serious is the interaction between Dimenhydrinate and Fluphenazine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Advise the patient to avoid driving and alcohol, and monitor older patients for confusion and urinary retention. Use the lowest effective dimenhydrinate dose for the shortest time.
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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