Drug interactions
Lofexidine + Moxifloxacin
Severity: Major
Lofexidine and Moxifloxacin: 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 moxifloxacin and lofexidine prolong the QT interval. Used together they may increase the risk of torsades de pointes, and lofexidine also causes bradycardia and hypotension that add to arrhythmic risk.
What this interaction means in plain words
Lofexidine and Moxifloxacin 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; Moxifloxacin belongs to Anti Bacterial.
Why it happens
Additive QT prolongation, with lofexidine-induced bradycardia increasing proarrhythmic susceptibility.
What to do
Avoid the combination if possible; otherwise obtain a baseline ECG, monitor QTc and heart rate, and correct electrolyte abnormalities.
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 Moxifloxacin
- Amiodarone + Moxifloxacin Contraindicated
- Arsenic trioxide + Moxifloxacin Contraindicated
- Disopyramide + Moxifloxacin Contraindicated
- Dofetilide + Moxifloxacin Contraindicated
- Dronedarone + Moxifloxacin Contraindicated
- Droperidol + Moxifloxacin 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 Lofexidine with Moxifloxacin?
MediHelp rates the interaction as major. Lofexidine and Moxifloxacin 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 moxifloxacin and lofexidine prolong the QT interval. Used together they may increase the risk of torsades de pointes, and lofexidine also causes bradycardia and hypotension that add to arrhythmic risk.
How serious is the interaction between Lofexidine and Moxifloxacin?
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 if possible; otherwise obtain a baseline ECG, monitor QTc and heart rate, and correct electrolyte abnormalities.
What other medicines interact with Moxifloxacin?
MediHelp also lists interactions of Moxifloxacin with, for example, Amiodarone, Arsenic trioxide, Disopyramide. The full list is on the Moxifloxacin page.
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