Drug interactions
Asenapine + Lofexidine
Severity: Major
Asenapine and Lofexidine: 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
Both drugs can prolong the QT interval, so combined use may raise the risk of torsades de pointes. Lofexidine also causes bradycardia and hypotension, which add to the arrhythmic risk, and sedation may be additive.
What this interaction means in plain words
Asenapine and Lofexidine 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.
Asenapine belongs to Central Nervous System; Lofexidine belongs to Central Nervous System.
Why it happens
Additive QT prolongation, with additive hypotensive, bradycardic and sedative effects.
What to do
Obtain a baseline ECG and monitor the QTc during combined use, correcting potassium and magnesium disturbances. Avoid the combination in patients with congenital long QT, bradycardia or other risk factors.
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 Asenapine
- Asenapine + Pimozide Contraindicated
- Asenapine + Thioridazine Contraindicated
- Asenapine + Vandetanib Contraindicated
- Adagrasib + Asenapine Major
- Alfentanil + Asenapine Major
- Alfuzosin + Asenapine 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 Asenapine with Lofexidine?
MediHelp rates the interaction as major. Asenapine and Lofexidine 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. Both drugs can prolong the QT interval, so combined use may raise the risk of torsades de pointes. Lofexidine also causes bradycardia and hypotension, which add to the arrhythmic risk, and sedation may be additive.
How serious is the interaction between Asenapine and Lofexidine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Obtain a baseline ECG and monitor the QTc during combined use, correcting potassium and magnesium disturbances. Avoid the combination in patients with congenital long QT, bradycardia or other risk factors.
What other medicines interact with Asenapine?
MediHelp also lists interactions of Asenapine with, for example, Pimozide, Thioridazine, Vandetanib. The full list is on the Asenapine page.
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