Drug interactions
Flavoxate + Olanzapine
Severity: Moderate
Flavoxate and Olanzapine: 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
Olanzapine has clinically relevant antimuscarinic activity that may add to flavoxate's effects, raising the risk of constipation, urinary retention, dry mouth and confusion. The legacy claims of reduced absorption and hypoglycemia are not well supported.
What this interaction means in plain words
Flavoxate and Olanzapine 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.
Flavoxate belongs to Genitourinary; Olanzapine belongs to Central Nervous System.
Why it happens
Additive anticholinergic pharmacodynamic effects.
What to do
Monitor for anticholinergic adverse effects such as urinary retention and constipation, and consider an alternative if they become troublesome.
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 Flavoxate
- Clozapine + Flavoxate Major
- Abobotulinumtoxina + Flavoxate Moderate
- Aclidinium + Flavoxate Moderate
- Amantadine + Flavoxate Moderate
- Amitriptyline + Flavoxate Moderate
- Amoxapine + Flavoxate Moderate
Other interactions of Olanzapine
Frequently asked questions
Can I take Flavoxate with Olanzapine?
MediHelp rates the interaction as moderate. Flavoxate and Olanzapine 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. Olanzapine has clinically relevant antimuscarinic activity that may add to flavoxate's effects, raising the risk of constipation, urinary retention, dry mouth and confusion. The legacy claims of reduced absorption and hypoglycemia are not well supported.
How serious is the interaction between Flavoxate and Olanzapine?
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 adverse effects such as urinary retention and constipation, and consider an alternative if they become troublesome.
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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