Drug interactions
Loxapine + Protriptyline
Severity: Moderate
Loxapine and Protriptyline: 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
Both drugs have anticholinergic activity and can affect cardiac conduction, and loxapine may raise tricyclic levels via CYP2D6 competition. Combined use may increase anticholinergic effects, seizure risk, and QT or arrhythmia risk.
What this interaction means in plain words
Loxapine and Protriptyline 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 anticholinergic, proconvulsant and cardiac conduction effects, with possible CYP2D6 competition.
What to do
Monitor ECG in patients at cardiac risk and watch for anticholinergic toxicity and seizures. Adjust protriptyline dose according to response and tolerability.
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 Protriptyline?
MediHelp rates the interaction as moderate. Loxapine and Protriptyline 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. Both drugs have anticholinergic activity and can affect cardiac conduction, and loxapine may raise tricyclic levels via CYP2D6 competition. Combined use may increase anticholinergic effects, seizure risk, and QT or arrhythmia risk.
How serious is the interaction between Loxapine and Protriptyline?
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 ECG in patients at cardiac risk and watch for anticholinergic toxicity and seizures. Adjust protriptyline dose according to response and tolerability.
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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