Drug interactions
Loxapine + Oxybutynin transdermal
Severity: Moderate
Loxapine and Oxybutynin transdermal: 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
Loxapine has anticholinergic activity that may add to the antimuscarinic effects of transdermal oxybutynin, causing dry mouth, constipation, urinary retention, blurred vision and confusion. Older patients are especially susceptible to cognitive effects.
What this interaction means in plain words
Loxapine and Oxybutynin transdermal 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 at peripheral and central muscarinic receptors.
What to do
Monitor for anticholinergic toxicity, including constipation, retention and confusion, and use the lowest effective doses. Consider a non-anticholinergic bladder agent in vulnerable patients.
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 Loxapine
- Alfentanil + Loxapine Major
- Alprazolam + Loxapine Major
- Amisulpride + Loxapine Major
- Amoxapine + Loxapine Major
- Apomorphine + Loxapine Major
- Belladonna and opium + Loxapine Major
Frequently asked questions
Can I take Loxapine with Oxybutynin transdermal?
MediHelp rates the interaction as moderate. Loxapine and Oxybutynin transdermal 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. Loxapine has anticholinergic activity that may add to the antimuscarinic effects of transdermal oxybutynin, causing dry mouth, constipation, urinary retention, blurred vision and confusion. Older patients are especially susceptible to cognitive effects.
How serious is the interaction between Loxapine and Oxybutynin transdermal?
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 toxicity, including constipation, retention and confusion, and use the lowest effective doses. Consider a non-anticholinergic bladder agent in vulnerable patients.
What other medicines interact with Loxapine?
MediHelp also lists interactions of Loxapine with, for example, Alfentanil, Alprazolam, Amisulpride. The full list is on the Loxapine page.
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