Drug interactions
Flavoxate + Thiothixene
Severity: Moderate
Flavoxate and Thiothixene: 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
Thiothixene has some antimuscarinic activity, so combining it with flavoxate may increase dry mouth, constipation and urinary retention. Antimuscarinics may also reduce the absorption of oral antipsychotics, though this effect is not well documented.
What this interaction means in plain words
Flavoxate and Thiothixene 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 antimuscarinic effects; possible reduced GI absorption through slowed motility.
What to do
Monitor for anticholinergic effects and for loss of antipsychotic response. Use the lowest effective flavoxate dose.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Flavoxate and Thiothixene, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
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 Thiothixene?
MediHelp rates the interaction as moderate. Flavoxate and Thiothixene 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. Thiothixene has some antimuscarinic activity, so combining it with flavoxate may increase dry mouth, constipation and urinary retention. Antimuscarinics may also reduce the absorption of oral antipsychotics, though this effect is not well documented.
How serious is the interaction between Flavoxate and Thiothixene?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for anticholinergic effects and for loss of antipsychotic response. Use the lowest effective flavoxate dose.
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.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
