Drug interactions
Flavoxate + OnabotulinumtoxinA
Severity: Moderate
Flavoxate and OnabotulinumtoxinA: 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
OnabotulinumtoxinA blocks acetylcholine release, and anticholinergic drugs may add to its effects. This could increase local or systemic weakness and anticholinergic symptoms, including urinary retention when used for bladder indications.
What this interaction means in plain words
Flavoxate and OnabotulinumtoxinA 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; OnabotulinumtoxinA belongs to Musculoskeletal.
Why it happens
Additive inhibition of cholinergic transmission, presynaptic by the toxin and receptor-level by flavoxate.
What to do
Monitor for excessive weakness, swallowing or breathing difficulty and urinary retention after injection. Consider stopping flavoxate if retention or systemic anticholinergic effects occur.
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 OnabotulinumtoxinA
Frequently asked questions
Can I take Flavoxate with OnabotulinumtoxinA?
MediHelp rates the interaction as moderate. Flavoxate and OnabotulinumtoxinA 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. OnabotulinumtoxinA blocks acetylcholine release, and anticholinergic drugs may add to its effects. This could increase local or systemic weakness and anticholinergic symptoms, including urinary retention when used for bladder indications.
How serious is the interaction between Flavoxate and OnabotulinumtoxinA?
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 excessive weakness, swallowing or breathing difficulty and urinary retention after injection. Consider stopping flavoxate if retention or systemic anticholinergic effects occur.
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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