Drug interactions
Asenapine transdermal + Perphenazine
Severity: Moderate
Asenapine transdermal and Perphenazine: 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 are antipsychotics that can prolong the QT interval and cause sedation. Used together they may add to the risk of ventricular arrhythmia, drowsiness and impaired psychomotor performance. Concurrent antipsychotic use also adds to extrapyramidal and metabolic burden.
What this interaction means in plain words
Asenapine transdermal and Perphenazine 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 pharmacodynamic effects on cardiac repolarization (QT prolongation), dopamine blockade and CNS depression.
What to do
Avoid routine antipsychotic polypharmacy where possible; if both are required, obtain a baseline ECG and monitor QTc and electrolytes. Correct hypokalemia and hypomagnesemia and watch for oversedation.
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 Perphenazine
- Ibutilide + Perphenazine Contraindicated
- Perphenazine + Pimozide Contraindicated
- Perphenazine + Thioridazine Contraindicated
- Adagrasib + Perphenazine Major
- Alfentanil + Perphenazine Major
- Amiodarone + Perphenazine Major
Frequently asked questions
Can I take Asenapine transdermal with Perphenazine?
MediHelp rates the interaction as moderate. Asenapine transdermal and Perphenazine 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 are antipsychotics that can prolong the QT interval and cause sedation. Used together they may add to the risk of ventricular arrhythmia, drowsiness and impaired psychomotor performance. Concurrent antipsychotic use also adds to extrapyramidal and metabolic burden.
How serious is the interaction between Asenapine transdermal and Perphenazine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid routine antipsychotic polypharmacy where possible; if both are required, obtain a baseline ECG and monitor QTc and electrolytes. Correct hypokalemia and hypomagnesemia and watch for oversedation.
What other medicines interact with Perphenazine?
MediHelp also lists interactions of Perphenazine with, for example, Ibutilide, Pimozide, Thioridazine. The full list is on the Perphenazine page.
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