Drug interactions
Chloroquine + Lofexidine
Severity: Major
Chloroquine 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 chloroquine and lofexidine can prolong the QT interval, so combined use raises the risk of torsades de pointes. Lofexidine also causes bradycardia and hypotension, which add to arrhythmic risk.
What this interaction means in plain words
Chloroquine 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.
Chloroquine belongs to Anti Parasitic; Lofexidine belongs to Central Nervous System.
Why it happens
Additive QT prolongation, with lofexidine-related bradycardia further increasing proarrhythmic risk.
What to do
Avoid the combination where possible; if needed, check ECG, heart rate, blood pressure, and electrolytes at baseline and during therapy.
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 Chloroquine
- Chloroquine + Cisapride Contraindicated
- Chloroquine + Dofetilide Contraindicated
- Chloroquine + Dronedarone Contraindicated
- Chloroquine + Droperidol Contraindicated
- Chloroquine + Panobinostat Contraindicated
- Chloroquine + Pimozide Contraindicated
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 Chloroquine with Lofexidine?
MediHelp rates the interaction as major. Chloroquine 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 chloroquine and lofexidine can prolong the QT interval, so combined use raises the risk of torsades de pointes. Lofexidine also causes bradycardia and hypotension, which add to arrhythmic risk.
How serious is the interaction between Chloroquine 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: Avoid the combination where possible; if needed, check ECG, heart rate, blood pressure, and electrolytes at baseline and during therapy.
What other medicines interact with Chloroquine?
MediHelp also lists interactions of Chloroquine with, for example, Cisapride, Dofetilide, Dronedarone. The full list is on the Chloroquine page.
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