Drug interactions
Flavoxate + Trifluoperazine
Severity: Minor
Flavoxate and Trifluoperazine: minor 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
Trifluoperazine has weak antimuscarinic activity, which can add to flavoxate's effects such as dry mouth, constipation and urinary retention. Anticholinergics may reduce phenothiazine absorption, although the evidence is limited.
What this interaction means in plain words
Flavoxate and Trifluoperazine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Additive antimuscarinic effects; possible reduced absorption through slowed GI motility.
What to do
Monitor for anticholinergic adverse effects and for reduced antipsychotic response. No routine dose adjustment is needed.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Flavoxate
- Clozapine + Flavoxate Major
- Abobotulinumtoxina + Flavoxate Moderate
- Aclidinium + Flavoxate Moderate
- Amantadine + Flavoxate Moderate
- Amitriptyline + Flavoxate Moderate
- Amoxapine + Flavoxate Moderate
Frequently asked questions
Can I take Flavoxate with Trifluoperazine?
MediHelp rates the interaction as minor. Flavoxate and Trifluoperazine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Trifluoperazine has weak antimuscarinic activity, which can add to flavoxate's effects such as dry mouth, constipation and urinary retention. Anticholinergics may reduce phenothiazine absorption, although the evidence is limited.
How serious is the interaction between Flavoxate and Trifluoperazine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for anticholinergic adverse effects and for reduced antipsychotic response. No routine dose adjustment is needed.
What other medicines interact with Flavoxate?
MediHelp also lists interactions of Flavoxate with, for example, Clozapine, Abobotulinumtoxina, Aclidinium. The full list is on the Flavoxate page.
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