Drug interactions
Lofexidine + Pimavanserin
Severity: Major
Lofexidine and Pimavanserin: 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 combining them raises the risk of torsades de pointes. Lofexidine-induced bradycardia and hypotension further increase the risk.
What this interaction means in plain words
Lofexidine and Pimavanserin 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.
Lofexidine belongs to Central Nervous System; Pimavanserin belongs to Central Nervous System.
Why it happens
Additive QTc prolongation through cardiac repolarization effects.
What to do
Avoid the combination where possible; if needed, obtain a baseline and follow-up ECG and correct potassium and magnesium. Monitor heart rate and blood pressure.
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 Lofexidine
- Adagrasib + Lofexidine Major
- Alfuzosin + Lofexidine Major
- Amiodarone + Lofexidine Major
- Amisulpride + Lofexidine Major
- Anagrelide + Lofexidine Major
- Apomorphine + Lofexidine Major
Other interactions of Pimavanserin
- Lefamulin + Pimavanserin Contraindicated
- Pimavanserin + Pimozide Contraindicated
- Pimavanserin + Vandetanib Contraindicated
- Adagrasib + Pimavanserin Major
- Amiodarone + Pimavanserin Major
- Amisulpride + Pimavanserin Major
Frequently asked questions
Can I take Lofexidine with Pimavanserin?
MediHelp rates the interaction as major. Lofexidine and Pimavanserin 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 combining them raises the risk of torsades de pointes. Lofexidine-induced bradycardia and hypotension further increase the risk.
How serious is the interaction between Lofexidine and Pimavanserin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination where possible; if needed, obtain a baseline and follow-up ECG and correct potassium and magnesium. Monitor heart rate and blood pressure.
What other medicines interact with Lofexidine?
MediHelp also lists interactions of Lofexidine with, for example, Adagrasib, Alfuzosin, Amiodarone. The full list is on the Lofexidine page.
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