Drug interactions
Flavoxate + Pyridostigmine
Severity: Moderate
Flavoxate and Pyridostigmine: 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
Pyridostigmine increases acetylcholine by inhibiting cholinesterase, whereas flavoxate blocks muscarinic receptors. Their effects oppose each other, which may blunt the muscarinic effects of pyridostigmine on bladder or gut. Muscle strength effects at nicotinic receptors are not blocked.
What this interaction means in plain words
Flavoxate and Pyridostigmine 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; Pyridostigmine belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism at muscarinic receptors.
What to do
Monitor for loss of pyridostigmine effect and for urinary retention. Review whether flavoxate is still needed.
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 Pyridostigmine
Frequently asked questions
Can I take Flavoxate with Pyridostigmine?
MediHelp rates the interaction as moderate. Flavoxate and Pyridostigmine 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. Pyridostigmine increases acetylcholine by inhibiting cholinesterase, whereas flavoxate blocks muscarinic receptors. Their effects oppose each other, which may blunt the muscarinic effects of pyridostigmine on bladder or gut. Muscle strength effects at nicotinic receptors are not blocked.
How serious is the interaction between Flavoxate and Pyridostigmine?
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 loss of pyridostigmine effect and for urinary retention. Review whether flavoxate is still 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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