Drug interactions
Fentanyl transdermal + Loxapine
Severity: Major
Fentanyl transdermal and Loxapine: major 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
Fentanyl with a sedating antipsychotic can produce additive respiratory depression, hypotension, profound sedation, coma and death. The long duration of the patch means effects can persist after dose changes.
What this interaction means in plain words
Fentanyl transdermal and Loxapine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Additive CNS and respiratory depression through pharmacodynamic synergism.
What to do
Use only when alternatives are inadequate, with the lowest effective doses. Monitor respiratory rate, sedation and blood pressure, particularly after dose increases.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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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 Fentanyl transdermal with Loxapine?
MediHelp rates the interaction as major. Fentanyl transdermal and Loxapine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Fentanyl with a sedating antipsychotic can produce additive respiratory depression, hypotension, profound sedation, coma and death. The long duration of the patch means effects can persist after dose changes.
How serious is the interaction between Fentanyl transdermal and Loxapine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use only when alternatives are inadequate, with the lowest effective doses. Monitor respiratory rate, sedation and blood pressure, particularly after dose increases.
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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