Drug interactions
Citalopram + Lofexidine
Severity: Major
Citalopram 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, and lofexidine also causes bradycardia and hypotension, which add to arrhythmia risk. Together they increase the chance of torsades de pointes.
What this interaction means in plain words
Citalopram 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.
Citalopram belongs to Central Nervous System; Lofexidine belongs to Central Nervous System.
Why it happens
Additive pharmacodynamic QT prolongation, with lofexidine-induced bradycardia further increasing proarrhythmic risk.
What to do
Avoid the combination where possible, or obtain a baseline ECG and monitor ECG, heart rate and blood pressure. Correct potassium and magnesium abnormalities before 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 Citalopram
- Cisapride + Citalopram Contraindicated
- Citalopram + Dronedarone Contraindicated
- Citalopram + Escitalopram Contraindicated
- Citalopram + Isocarboxazid Contraindicated
- Citalopram + Methylene blue Contraindicated
- Citalopram + Phenelzine 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 Citalopram with Lofexidine?
MediHelp rates the interaction as major. Citalopram 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, and lofexidine also causes bradycardia and hypotension, which add to arrhythmia risk. Together they increase the chance of torsades de pointes.
How serious is the interaction between Citalopram 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, or obtain a baseline ECG and monitor ECG, heart rate and blood pressure. Correct potassium and magnesium abnormalities before and during therapy.
What other medicines interact with Citalopram?
MediHelp also lists interactions of Citalopram with, for example, Cisapride, Dronedarone, Escitalopram. The full list is on the Citalopram page.
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