Drug interactions
Fesoterodine + Letibotulinumtoxina
Severity: Moderate
Fesoterodine and Letibotulinumtoxina: 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
Anticholinergic drugs may add to the effects of botulinum toxin and could worsen systemic weakness or anticholinergic symptoms if toxin spreads beyond the injection site. The risk is mostly theoretical at usual doses.
What this interaction means in plain words
Fesoterodine and Letibotulinumtoxina 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 antagonism of cholinergic transmission, with toxin blocking acetylcholine release and fesoterodine blocking muscarinic receptors.
What to do
Monitor for generalized weakness, swallowing or breathing difficulty and anticholinergic effects after injection, and consider stopping fesoterodine if they develop.
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 Fesoterodine
Frequently asked questions
Can I take Fesoterodine with Letibotulinumtoxina?
MediHelp rates the interaction as moderate. Fesoterodine and Letibotulinumtoxina 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. Anticholinergic drugs may add to the effects of botulinum toxin and could worsen systemic weakness or anticholinergic symptoms if toxin spreads beyond the injection site. The risk is mostly theoretical at usual doses.
How serious is the interaction between Fesoterodine and Letibotulinumtoxina?
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 generalized weakness, swallowing or breathing difficulty and anticholinergic effects after injection, and consider stopping fesoterodine if they develop.
What other medicines interact with Fesoterodine?
MediHelp also lists interactions of Fesoterodine with, for example, Bethanechol, Clozapine, Levoketoconazole. The full list is on the Fesoterodine page.
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