Drug interactions
Lofexidine + Perphenazine
Severity: Moderate
Lofexidine 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 can cause sedation and hypotension, so combined use may increase drowsiness and dizziness. Lofexidine can also prolong the QT interval and cause bradycardia, and perphenazine may add to the QT effect.
What this interaction means in plain words
Lofexidine 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.
Lofexidine belongs to Central Nervous System; Perphenazine belongs to Central Nervous System.
Why it happens
Additive CNS depression, hypotensive effects and QTc prolongation.
What to do
Monitor blood pressure, heart rate and sedation, and obtain an ECG in patients with cardiac risk factors. Correct electrolyte abnormalities and avoid other QT-prolonging drugs.
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
Other interactions of Lofexidine
- Adagrasib + Lofexidine Major
- Alfuzosin + Lofexidine Major
- Amiodarone + Lofexidine Major
- Amisulpride + Lofexidine Major
- Anagrelide + Lofexidine Major
- Apomorphine + Lofexidine Major
Frequently asked questions
Can I take Lofexidine with Perphenazine?
MediHelp rates the interaction as moderate. Lofexidine 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 can cause sedation and hypotension, so combined use may increase drowsiness and dizziness. Lofexidine can also prolong the QT interval and cause bradycardia, and perphenazine may add to the QT effect.
How serious is the interaction between Lofexidine 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: Monitor blood pressure, heart rate and sedation, and obtain an ECG in patients with cardiac risk factors. Correct electrolyte abnormalities and avoid other QT-prolonging drugs.
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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